Cirrus Logic CS5372 User Manual

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CS5371 CS5372

Low-power, High-performance

Features & Description

z Fourth-order ∆Σ Architecture z Clock-jitter-tolerant Architecture z Input Voltage: 5 V z High Dynamic Range

 127 dB SNR @ 215 Hz BW (2 ms Output)  124 dB SNR @ 430 Hz BW (1 ms Output)

z Low Total Harmonic Distortion

 -118 dB THD Typical, -112 dB THD Maximum

z Low Power Consumption

 Normal Mode: 25 mW per Channel  Low-power Mode: 15 mW per Channel

z Small Footprint, 24-pin SSOP Package z Single- or Multi-channel System Support

 1-channel System: CS5371  2-channel System: CS5372  3-channel System: CS5371 + CS5372  4-channel System: CS5372 + CS5372

z Single or Dual Power Supply Configurations

 VA+ = +5 V; VA- = 0 V; VD = +3.3 V to +5 V  VA+ = +2.5 V;VA- = -2.5 V;VD = +3.3 V

Fully Differential

∆Σ

Modulators

Description

The CS5371 and CS5372 are one- and two-channel, high dynamic range, fourth-order ∆Σ modulators intended for geophysical and sonar applications. Used in combination with the CS5376A or CS5378 digital filters, a unique high-resolution A/D measurement system results.

The CS5371 and CS5372 have high dynamic range (127 dB @ 215 Hz bandwidth) and low total harmonic distortion (typically -118 dB THD), with very low power consumption per channel. In normal mode (LPWR=0, MCLK=2.048MHz), power consumption is 25 mW per channel, and in low-power mode (LPWR=1, MCLK=1.024MHz), power consumption is 15 mW per channel. Each modulator can be independently powered down to 1 mW per channel, and by halting the input clock, they will enter a micropower state using only 10 µW per channel.

The modulators generate an oversampled serial bit stream at 512 kbits per second when operated from a clock frequency of 2.048 MHz. They are available in a small 24-pin SSOP package, providing exceptional performance in a very small footprint.

ORDERING INFORMATION

See page 21.

VA+

INF+ INR+

INRINF-

VREF+

VREF-

4TH ORDER

∆−Σ

MODULATOR

CS5371

VA-

http://www.cirrus.com

PWDN

OFST LPWR DGND

MFLAG

MDATA

CLOCK

GENERATOR

MCLK MSYNC

INF1+ INR1+

INR1INF1-

VREF+

VREF-

INF2+ INR2+

INR2INF2-

VA+

VA-

4TH ORDER

∆−Σ

MODULATOR

4TH ORDER

∆−Σ

MODULATOR

PWDN1

PWDN2

OFST LPWR DGND

CLOCK

GENERATOR

CS5372

MFLAG1

MDATA1

MCLK MSYNC

MFLAG2

MDATA2

OCT ‘05

DS255F3

TABLE OF CONTENTS

1. CHARACTERISTICS & SPECIFICATIONS ................................................... 3

ANALOG CHARACTERISTICS .................................................................. 3

DIGITAL CHARACTERISTICS ................................................................... 5

ABSOLUTE MAXIMUM RATINGS ............................................................. 5

SWITCHING CHARACTERISTICS ............................................................ 6

2. GENERAL DESCRIPTION. ........................................................................... 7

3. MODULATOR PERFORMANCE ................................................................... 9

3.1. Full-scale Signal Performance ........................................................... 9

3.2. Noise Performance ............................................................................ 9

4. SIGNAL INPUTS ........................................................................................... 9

4.1. Differential Inputs - INR+/-, INF+/- ..................................................... 9

4.2. Anti-alias Filters ............................................................................... 10

4.3. Input Impedance .............................................................................. 10

4.4. Maximum Signal Levels ................................................................... 10

5. INPUT OFFSET ........................................................................................... 10

5.1. Offset Enable - OFST ...................................................................... 11

5.2. Offset Drift........................................................................................ 11

6. VOLTAGE REFERENCE INPUTS .............................................................. 11

6.1. Voltage Reference Configurations ................................................... 12

6.2. VREF Input Impedance.................................................................... 12

6.3. Gain Accuracy.................................................................................. 12

6.4. Gain Drift.......................................................................................... 12

7. DIGITAL FILTER INTERFACE ................................................................... 12

7.1. Modulator Clock - MCLK.................................................................. 13

7.2. Modulator Data - MDATA................................................................. 13

7.3. Modulator Sync - MSYNC................................................................ 13

7.4. Modulator Flag - MFLAG ................................................................. 13

8. POWER MODES ......................................................................................... 14

8.1. Normal Power Mode ........................................................................ 14

8.2. Low Power Mode - LPWR................................................................ 14

8.3. Power Down Mode - PWDN ............................................................ 14

8.4. Micro-power Mode ........................................................................... 14

9. POWER SUPPLY ........................................................................................ 14

9.1. Power Supply Configurations........................................................... 14

9.2. Power Supply Bypassing ................................................................. 14

9.3. SCR Latch-up Considerations ......................................................... 15

9.4. DC-DC Converter Considerations.................................................... 15

9.5. Power Supply Rejection................................................................... 15

10. PIN DESCRIPTION - CS5371 ..................................................................... 16

11. PIN DESCRIPTION - CS5372 ..................................................................... 18

12. PACKAGE DIMENSIONS ............................................................................ 20

13. ORDERING INFORMATION ....................................................................... 21

14. ENVIRONMENTAL, MANUFACTURING, & HANDLING INFORMATION.. 21

15. REVISION HISTORY ................................................................................... 21

CS5371 CS5372

2 DS255F3

1. CHARACTERISTICS & SPECIFICATIONS

CS5371 CS5372

ANALOG CHARACTERISTICS Notes:T

= -40 C to +85 C; VA+ = 5V or 2.5V ± 5%; VA - = 0V or

-2.5V ± 5%; VD = 5V or 3.3V ± 5%; DGND = 0V; MCLK = 2.048 MHz; [(VREF+) - (VREF-)] = 2.5V; Devices are connected as shown in Figure 3, the System Connection Diagram.

CS5371-BS / CS5372-BS

Parameter Symbol

Specified Temperature Range T

-40 - +85 C

UnitMin Typ Max

Dynamic Performance

Dynamic Range (Note 1) LPWR = 0 0 Hz to 1720 Hz MCLK = 2.048 MHz 0 Hz to 860 Hz

0 Hz to 430 Hz

0 Hz to 215 Hz 0 Hz to 107.5 Hz 0 Hz to 53.75 Hz

0 Hz to 26.875 Hz

Dynamic Range (Note 1) LPWR = 1 0 Hz to 1720 Hz MCLK = 1.024 MHz 0 Hz to 860 Hz

0 Hz to 430 Hz

0 Hz to 215 Hz 0 Hz to 107.5 Hz 0 Hz to 53.75 Hz

0 Hz to 26.875 Hz

Total Harmonic Distortion (Note 2)

SNR

121

118

109 121 124 127 130 133 136

106 118 121 124 127 130 133

THD - -118 -112 dB

dB dB dB dB dB dB dB

LPWR = 0; MCLK = 2.048 MHz Total Harmonic Distortion (Note 2)

THD

--114-108dB

LPWR = 1; MCLK = 1.024 MHz

DC Accuracy

Channel to Channel Gain Variation (Note 3) CGV - 1 - % Full-scale Drift (Notes 3 and 4) TC Offset (Note 3) V

ZSE

-5-ppm/C

-1-mV Offset after Calibration (Note 5) - ±1 - µV Offset Calibration Range (Note 6) - 100 - %F.S. Offset Drift (Notes 3 and 4) TC

ZSE

-1-µV/C

Notes: 1. Dynamic Range defined as 20 log [ (RMS full scale) / (RMS idle noise) ]

2. Tested with full-scale input signal of 31.25 Hz; OWR = 1000 SPS; OFST = 1.

3. Specification is for the parameter over the specified temperature range for the CS5371/72 devices only and does not include the effects of external components.

4. Specifications are guaranteed by design and/or characterization.

5. The offset after calibration specification applies to the effective offset voltage for a full-scale input to the CS5371/72 modulator, but is measured from the output digital codes from the digital filter.

6. The CS5371/72 offset calibration is performed digitally and includes the full-scale range.

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CS5371 CS5372

ANALOG CHARACTERISTICS (Continued)

Parameter Symbol Min Typ Max Unit

Specified Temperature Range T

Input Characteristics

Input Signal Frequencies (Note 7) BW DC - 1720 Hz

Input Voltage Range (Note 8) VIN - - 5 V

Input Over-range Voltage Tolerance (Note 8) I

Input Signal plus Common Mode (VA-)

Common Mode Rejection Ratio CMRR - 90 - dB

Channel Crosstalk (CS5372 only) CXT - -120 - dB

Voltage Reference Input

VREF (VREF+) - (VREF-) - 2.5 - V

VREF Current - - 120 µA

Power Supplies

DC Power Supply Currents (Note 9 and 10) LPWR = 0; MCLK = 2.048 MHz Analog

Digital

LPWR = 1; MCLK = 1.024 MHz Analog

Digital

Power Down Modes CS5371 PWDN = 1

PWDN = 1, MCLK = 0

OVR

-40 - +85 C

5--%F.S.

-(VA+)

+ 0.7V

5.0

0.2

3.0

0.2

- 1.7V

7.0

0.3

4.5

0.3

mA mA mA mA

µW

p-p

CS5372 PWDN1 or PWDN2 = 1

PWDN1 = PWDN2 = 1

PWDN1 = PWDN2 = 1, MCLK = 0

Power Supply Rejection (Note 11) PSRR - 90 - dB

Notes: 7. The upper bandwidth limit is determined by the digital filter. A simple single pole anti-alias filter with a -

3 dB frequency at (MCLK / 256) should be placed in front of each channel.

8. The input voltage range is for the configuration depicted in Figure 3, the System Connection Diagram, and applies to signal frequencies from DC to the stop-band frequency selected in the digital filter.

9. Per channel. All outputs unloaded. All digital inputs forced to VD or GND respectively.

10. In Low Power Mode LPWR = 1, the Master Clock MCLK is reduced to 1.024 MHz. This reduces the oversampled signal bandwidth by a factor of 2.

11. Tested with a 50 Hz 100 mVpp sine wave applied separately to each supply.

mW mW

µW

4 DS255F3

CS5371 CS5372

DIGITAL CHARACTERISTICS Notes:T

= 25 C; VA+ = 5V or 2.5V ±5%; VA- = 0V or -2.5V ±5%;

VD = 5V or 3.3V ± 5%; DGND = 0V; All voltages with respect to DGND.

Parameter Symbol Min Typ Max Unit

High-level Input Voltage V

Low-level Input Voltage V

High-level Output Voltage I

Low-level Output Voltage I

= -5.0 mA V

out

= 5.0 mA V

out

Input Leakage Current I

3-state Leakage Current I

Digital Output Pin Capacitance C

out

0.6 * VD - VD V

0.0 - 0.8 V

(VD) - 1.0 - - V

--0.4V

-±1±10µA

--±10µA

-9-pF

ABSOLUTE MAXIMUM RATINGS Notes:DGND = 0 V

Parameter Symbol Min Typ Max Unit

DC Power Supplies (Notes 12 and 13) Positive Digital

Positive Analog

Negative Analog

Input Current, Any Pin Except Supplies (Note 14 and 15) I

Input Current, Supplies (Note 15) I

Output Current I

Power Dissipation (Note 16) PDN - - 500 mW

Analog Input Voltage All Analog Pins V

Digital Input Voltage All Digital Pins V

Ambient Operating Temperature T

Storage Temperature T

VA+

VA-

OUT

INA

IND

stg

-0.3

-3.3

+6.0 +6.0 +0.3

--±10mA

--±50mA

--±25mA

(VA-) - 0.5 - (VA+) + 0.5 V

-0.5 - (VD) + 0.5 V

-40 - 85 °C

-65 - 150 °C

V V V

Notes: 12. VA+ and VA- must satisfy {(VA+) - (VA-)} < +6.8 V.

13. VD and VA- must satisfy {(VD) - (VA-)} < +7.6 V.

14. Includes continuous over-voltage conditions at the analog input (AIN) pins.

15. Transient current of up to 100 mA can be safely tolerated without SCR latch-up.

16. Total power dissipation, including all input and output currents.

DS255F3 5

CS5371 CS5372

SWITCHING CHARACTERISTICS Notes:T

= 0V or -2.5V ± 5%; VD = +5V or +3.3V ± 5%; Digital Inputs: Logic 0 = 0V, Logic 1 = VD; C

= -40 C to +85 C; VA+ = +5V or +2.5V ± 5%; VA-

=50pF

Parameter Symbol Min Typ Max Unit

MCLK Frequency (Note 17) f

0.1 2.048 2.2 MHz

MCLK Duty Cycle 40 - 60 %

MCLK Jitter (In-band or aliased in-band) - - 300 ps

MCLK Jitter (Out-of-band) - - 1 ns

Rise Times: Any Digital Input (Note 18)

Any Digital Output

Fall Times: Any Digital Input (Note 18)

Any Digital Output

MSYNC Setup Time to MCLK falling (Note 19) t

MSYNC Hold Time after MCLK falling t

MCLK rising to Valid MFLAG t

MCLK rising to Valid MDATA t

risein

riseout

fallin

fallout

mss

msh

mfh

mdv

100

20 - - ns

-3565ns

-6090ns

Notes: 17. If MCLK is removed, the CS5372 enters a micro power state.

18. Excludes MCLK input, MCLK should be driven with a signal having rise/fall times of 25 ns or faster.

19. MSYNC latched on MCLK falling edge, data output on next MCLK rising edge.

ns ns

MCLK

mss

MSYNC

MDATA

MFLAG

risein

fallin

mdv

0.9 * VD

0.1 * VD

Figure 1. Rise and Fall Times

msh

VALID DATA

riseout

mdv

mfh

VALID DATA

fallout

0.9 * VD

0.1 * VD

Figure 2. CS5372 Interface Timing

6 DS255F3

CS5371 CS5372

2. GENERAL DESCRIPTION.

The CS5371 and CS5372 are one- and two- channel fourth-order ∆Σ modulators, optimized for extremely high-resolution measurement of signals between DC and 1600 Hz. They are designed to be used with the CS5376A and CS5378 low-power digital filters. Figure 3 on page 8 shows a fourchannel system connection diagram for two CS5372 and one CS5376A.

High Performance

The CS5371/72 modulators have exceptional performance characteristics. Modulator dynamic range (SNR) is 127 dB over a 215 Hz bandwidth (2 ms sampling), with total harmonic distortion (THD) of -118 dB.

Low Power Consumption

The CS5371/72 modulators have very low power consumption. Power consumption is only 25 mW per channel in normal mode (LPWR=0, MCLK=2.048 MHz), and 15 mW per channel in low power mode (LPWR=1, MCLK=1.024 MHz).

An independently selectable power-down mode (PWDN=1) can be used to disable a modulator and reduces its power consumption to 1 mW. If MCLK is then halted (MCLK=0), the modulator enters a micropower state using only 10

µW per channel.

Small Package Size

The CS5371/72 modulators are available in a very small 24-pin SSOP package approximately 8 mm x 8 mm in size. The CS5372 has two modulator channels per package to increase board layout density even further.

Multi-channel System Support

Combining the CS5371 and CS5372 modulators with a digital filter permits multiple system configurations:

1 Channel - CS5371, CS5378

2 Channel - CS5372, CS5376A

3 Channel - CS5371, CS5372, CS5376A

4 Channel - CS5372, CS5372, CS5376A

Differential Analog Signal Inputs

The CS5371/72 modulators have fully differential analog inputs capable of measuring signals up to

5.0 V peak-to-peak when using a 2.5 V voltage reference. The inputs will tolerate a 5% over-range voltage and continue operating at full specification.

Digital Filter Interface

The CS5371/72 modulators are designed to operate with the CS5376A and CS5378 digital filters. The digital filter generates the modulator clock and synchronization signal inputs (MCLK and MSYNC), while receiving the modulator data and over-range flag outputs (MDATA and MFLAG). The modulators produce an oversampled ∆Σ serial bit stream at 512 kbits per second when operated from a 2.048 MHz modulator clock.

Multiple Power Supply Configurations

The CS5371/72 modulators support flexible power supply configurations. They can run from single or dual supplies in the following configurations:

 VA+ = +5V; VA- = 0V; VD = +3.3V to +5V  VA+ = +2.5V; VA- = -2.5V; VD = +3.3V

DS255F3 7

CS5371 CS5372

VA +

VA -

Channel 1

VREF

VA+

100 µF

499 Ω 499 Ω

499 Ω

499 Ω 499 Ω

~Channel 2

499 Ω 499 Ω

10 Ω

100 µF

0.02 µF

COG

0.02 µF

COG

0.01 µF

0.02 µF

0.01µF

X7R

INRI+

INFI+

INFI-

INRI-

INR2+

INF2+

INF2-

INR2-

VREF+

VREF-

VA+ VD

MDATA1

MFLAG2

MDATA2

CS5372

MSYNC

PWDN1

PWDN2

VA- DGND

0.01 µF

LAG1

MCLK

OFST

LPWR

100 µF

MFLAG1

MDATA1

MFLAG2

MDATA2

MCLK

MSYNC

GPIO4

GPIO5

GPIO6

GPIO7

CS5376A

10 Ω

100 µF

499 Ω

~Channel 3

499 Ω

~Channel 4

499 Ω

VA -

100 µF

0.02 µF

COG

0.02 µF

COG

0.01µF

0.01 µF

0.02 µF

X7R

0.02 µF

X7R

VREF+

VREF-

INRI+

INFI+

INFI-

INRI-

INR2+

INF2+

INF2-

INR2-

VA+ VD

MSYNC

PWDN1

PWDN2

CS5372

MFLAG1

MDATA1

MFLAG2

MDATA2

VA- DGND

MCLK

OFST

LPWR

MFLAG3

MDATA3

MFLAG4

MDATA4

Figure 3. System Connection Diagram

8 DS255F3

CS5371 CS5372

3. MODULATOR PERFORMANCE

Figures 4 and 5 illustrate the spectral performance of the CS5371/72 modulators when combined with the CS5376A or CS5378 digital filter. The plots were created from ten averaged 1024 point FFTs.

3.1. Full-scale Signal Performance

Figure 4 illustrates the full-scale signal performance of the CS5371/72 modulators and digital filter using a 31.25 Hz input signal and a 1000 SPS output word rate. The outstanding full-scale signal characteristics of the CS5371/72 modulators are shown, with no harmonic components exceeding 120 dB. Analysis of this data set yields a signal-tonoise ratio (SNR) of 124.0 dB and a signal-to-distortion ratio (SDR) of 119.0 dB. Note that the fullscale signal peak in Figure 4 shows a slightly reduced amplitude due to spectral smearing associated with the FFT windowing function, and is a purely digital phenomenon.

3.2. Noise Performance

Figure 5 illustrates the noise performance of the CS5371/72 modulators and digital filter using a

31.25 Hz -24 dB input signal at a 1000 SPS output word rate. The outstanding noise characteristics of the CS5371/72 modulators are shown, with the averaged noise components consistently below the

-150 dB level. Analysis of this data set yields a dynamic range of 124.7 dB. Note that the 0.7 dB

variation between the signal-to-noise calculation in Figure 4 and the dynamic range calculation in Figure 5 is not modulator dependent and results from jitter in the test signal generator when producing a full-scale output, as evidenced by the skirt surrounding the signal peak below the -140 dB level in Figure 4.

4. SIGNAL INPUTS

The CS5371/72 modulators use a switched capacitor architecture for the analog signal inputs, which has increased jitter tolerance compared with continuous time signal input stages.

4.1. Differential Inputs - INR+/-, INF+/-

The analog signal inputs are differential and use four pins: INR+, INR-, INF+, and INF-. Two inputs, INR+ and INF+, are connected to the positive half of the differential signal, while two inputs, INR- and INF-, are connected to the negative half. The INR+ and INR- pins are switched capacitor ‘rough charge’ inputs that pre-charge the internal sampling capacitor before it is connected to the INF+ and INF- fine input pins.

The full-scale analog signal span is defined by the voltage applied across the VREF+ and VREFpins. A 2.5 volt reference input sets full-scale signals as 5 volts peak-to-peak, fully differential. Differential inputs increase the dynamic range of

-20

-40

-60

-80

-100

-120

-140

-160

-180

-200 0 50 100 150 200 250 300 350 400 450 500

Figure 4. 1024 Point FFT plot with a 31.25 Hz

input at Full-scale, ten averages

S/N = 124.0 dB S/D = 119.0 dB

-20

-40

-60

-80

-100

-120

-140

-160

-180

-200 0 50 100 150 200 250 300 350 400 450 500

Figure 5. 1024 Point FFT plot with a 31.25 Hz

input at -24 dB, ten averages

Dynamic Range = 124.7 dB

DS255F3 9

CS5371 CS5372

small signals, reducing the gain requirements for input amplifier stages by a factor of two relative to single ended analog inputs.

4.2. Anti-alias Filters

The CS5371/72 modulator inputs must be bandwidth limited to ensure modulator loop stability and to prevent aliased high-frequency signals. The modulators are 4th order and so are conditionally stable, and can be adversely affected by high amplitude out-of-band signals. Also, aliasing effects degrade modulator performance if the analog inputs are not bandwidth limited since out-of-band signals can appear in the measurement bandwidth. The use of a simple single pole low-pass anti-alias filter on the differential inputs ensures out-of-band signals are eliminated.

Anti-alias filtering may be accomplished actively in an amplifier stage ahead of the CS5371/72 modulator, or passively using an RC filter across the differential rough and fine analog inputs. An RC filter is recommended, even when using an amplifier stage, as it minimizes the ‘charge kick’ that the driving amplifier sees as switched capacitor sampling is performed.

The -3 dB corner of the input anti-alias filter should be set to the internal modulator sampling clock divided by 64. The modulator sampling clock is a division by 4 of the modulator clock, MCLK. With MCLK=2.048 MHz the modulator sampling clock is 512 kHz, requiring an input filter with a -3 dB corner at 8 kHz.

MCLK Frequency = 2.048 MHz

Sampling Frequency = MCLK / 4 = 512 kHz

-3 dB Filter Corner = Sample Freq / 64 = 8 kHz

RC filter = 8 kHz = 1 / [ 2π * (2 * R

It should be noted that when using low power mode (LPWR=1 and MCLK=1.024 MHz) the modulator sampling clock is 256 kHz, so the -3 dB filter corner should be scaled down to 4 kHz.

MCLK Frequency = 1.024 MHz

Sampling Frequency = MCLK / 4 = 256 kHz

diff

) * C

diff

]

Figure 3 illustrates the CS5372/CS5376A system connections with input anti-alias filter components. Filter components on the rough and fine pins should be identical values for optimum performance, with the capacitor values a minimum of

0.02 µF. The rough input can use either X7R or C0G capacitors, while the fine input requires C0G type capacitors for optimal linearity. Using X7R capacitors on the fine inputs will degrade signal to distortion performance up to 8 dB.

4.3. Input Impedance

Due to the dynamic switched-capacitor input architecture, the input current required from the analog signal source and thus the input impedance of the analog input pins changes any time MCLK is changed. The input impedance of the rough charge inputs, INR+ and INR-, is [1 / (f * C)] where f is the modulator clock frequency, MCLK, and C is the internal sampling capacitor. A 2.048 MHz modulator clock yields a rough input impedance of approximately [1 / (2.048 MHz)*(20 pF)], or about 24 kΩ.

Internal to the modulator the rough charge inputs pre-charge the sampling capacitor used by the fine inputs, therefore the input current to the fine inputs is very low and the effective input impedance is orders of magnitude above the impedance of the rough inputs.

4.4. Maximum Signal Levels

The CS5371/72 modulators are 4th order and are therefore conditionally stable, and may go into an oscillatory condition if the analog inputs over-range beyond full scale by more than 5%. If an unstable condition is detected, the modulators collapse to a 1st order system until loop stability is achieved. During this time, the MFLAG pin transitions from low to high signaling the digital filter to set an error bit in the digital output status word. The analog input signal must be reduced to within the full-scale range of the converter for at least 32 MCLK cycles for the modulators to recover from an unstable condition.

-3 dB Filter Corner = Sample Freq / 64 = 4 kHz

RC filter = 4 kHz = 1 / [ 2π * (2 * R

10 DS255F3

diff

) * C

diff

]

5. INPUT OFFSET

The CS5371/72 modulators are ∆Σ type and so can produce ‘idle tones’ in the passband when the

CS5371 CS5372

input signal is a steady state DC signal within ±50 mV of the common mode input voltage. Idle tones result from patterns in the output bitstream and appear in the measurement spectrum about

-135 dB down from full scale.

Idle tones can be eliminated by adding differential DC offset to the modulator inputs. The added offset should be applied differentially to the inputs, common mode offsets do not affect idle tones.

5.1. Offset Enable - OFST

If the analog inputs are near the common mode voltage when no signal is present, the OFST pin can be used to eliminate idle tones. When OFST=1, -50 mV of differential offset is added to the modulator analog inputs to push the idle tones out of the measurement bandwidth. Care should be taken that when OFST is active, offset voltages generated by external circuitry do not negate the internally added offset.

5.2. Offset Drift

Offset drift characteristics vary from part to part and with changes in the power supply voltages. If the CS5371/72 is used in precision DC measurement applications where offset drift is to be minimized, the power supplies should be well regulated.

For the lowest offset drift, the CS5371/72 modulators should operate with an MCLK of 2.048 MHz. The offset drift rate is inversely proportional to clock frequency, with slower modulator clock rates exhibiting more offset drift. Operating from an MCLK of 1.024 MHz results in twice the offset drift rate compared to an MCLK of 2.048 MHz.

Because offset drift is not linear with temperature, an exact drift rate per °C cannot be specified. The CS5371/72 modulators will exhibit approximately 5 ppm/°C of offset drift operating with an MCLK of

2.048 MHz.

6. VOLTAGE REFERENCE INPUTS

The CS5371/72 modulators are designed to operate with a 2.5 V voltage reference applied across the VREF+ and VREF- pins to set the full-scale signal range of the analog inputs. A 2.5 V voltage reference results in the highest dynamic range and best signal-to-noise performance, though smaller reference voltages may be used. When the CS5371/72 modulators are operated with a 2.5 V reference, the analog inputs measure full-scale signals of 5 volts peak-to-peak fully differential.

In a single supply power configuration the voltage reference output should be connected to the VREF+ pin with the VREF- pin connected to ground. In a dual supply power configuration the voltage reference should be powered from the VA+ and VA- supplies, with the modulator VREF+ pin connected to the voltage reference output and the VREF- pin connected to VA-. Because most 2.5 V voltage references require a power supply voltage greater than 3 V to operate, when powering the voltage reference from dual supplies the reference voltage into the VREF+ pin should be defined relative to the VA- supply.

The selected voltage reference should produce less than 1 µVrms of noise in the measurement bandwidth on the VREF+ pin. The digital filter output word rate selection determines the bandwidth

DS255F3 11

CS5371 CS5372

over which voltage reference noise affects the CS5371/72 modulator dynamic range.

6.1. Voltage Reference Configurations

For a 2.5 V reference, the Linear Technology LT1019-2.5 voltage reference yields low enough noise if the output is filtered with a low pass RC filter as shown in Figure 6. The filtered version in Figure 6 is acceptable for most spectral measurement applications, but a buffered version with lower source impedance may be preferred for DC measurement applications.

6.2. VREF Input Impedance

The switched-capacitor input architecture of the VREF+ pin causes the input current required from the voltage reference to change any time MCLK is changed. The input impedance of the voltage reference input is calculated similar to the analog signal input impedance as [1 / (f * C)] where f is the modulator clock frequency, MCLK, and C is the internal sampling capacitor. A 2.048 MHz MCLK yields a voltage reference input impedance of approximately [1 / (2.048 MHz)*(20 pF)], or about 24 kΩ.

6.3. Gain Accuracy

Gain accuracy of the CS5371/72 modulators is affected by variations of the voltage reference input. A change in the voltage reference input impedance due to a change in MCLK could affect gain accura-

cy when using the higher source impedance configuration of Figure 6. The VREF+ pin input impedance and the external low-pass filter resistor create a voltage divider for the output reference voltage, reducing the effective voltage reference input. If gain error is to be minimized, especially when MCLK is to be changed, the voltage reference should have a low output impedance to minimize the effect of the resistive voltage divider. A buffered voltage reference configuration offers lower output impedance and more stable gain characteristics.

6.4. Gain Drift

Gain drift of the CS5371/72 modulators due to temperature is around 5 ppm/°C, and does not include the temperature drift characteristics of the external voltage reference. Gain drift is not affected by the modulator sample rate or by power supply variations.

7. DIGITAL FILTER INTERFACE

+VA

-VA

12 DS255F3

0.1µF

Ω

2.5 REF

0.1µF 100µF

0.1µF

Figure 6. 2.5 Voltage Reference

To VREF+

To VREF -

CS5371 CS5372

bit stream at 512 kbits per second when operated from a 2.048 MHz modulator clock.

7.1. Modulator Clock - MCLK

For proper operation, the CS5371/72 modulators must be provided with a CMOS compatible clock on the MCLK pin. MCLK is internally divided by four to generate the modulator sampling clock. MCLK must have less than 300 ps of in-band jitter to maintain full performance specifications.

When used with the CS5376A or CS5378 digital filter, MCLK is automatically generated and is typically 2.048 MHz or 1.024 MHz. MCLK can be generated by other means, using a crystal oscillator for example, and can run any rate between 100 kHz and 2.2 MHz. If MCLK is disabled, the modulators are automatically placed into a micropower state. They are equipped with loss of clock detection circuitry to force power down if MCLK is removed.

The choice of MCLK frequency affects the performance of the CS5371/72 modulators. They exhibit the best dynamic range (SNR) performance with faster MCLK rates because of increased oversampling of the analog input signal. The modulators exhibit the best total harmonic distortion (THD) performance with slower MCLK rates because slower sampling allows more time to settle the analog input signal.

7.2. Modulator Data - MDATA

The CS5371/72 modulators output a ∆Σ serial bitstream to the MDATA pin, with a one’s density proportional to the amplitude of the analog input signal and a bit rate determined by the modulator sampling clock. The modulator sampling clock is a divide by four of MCLK, so for a 2.048 MHz MCLK the modulator sampling clock and MDATA output bit rate will be 512 kHz.

The MDATA output has a one’s density defined as nominal 50% for no signal input, 86% for positive full scale, and 14% for negative full scale. It has a maximum positive over-range capability to 93% and a maximum negative over-range capability to 7%. The one’s density of the MDATA output is defined as the ratio of ‘1’ bits to total bits in the serial bitstream output, i.e. an 86% one’s density has, on

average, a ‘1’ value in 86 of every 100 output data bits.

When operated with the CS5376A or CS5378 digital filter, the full-scale 24-bit output codes range from 0x5D1C41 to 0xA2EAAE with the internal OFST disabled.

Digital Filter

Modulator Input

Signal

> + (VREF + 5%) Error Flag Possible

+VREF 5D1C41 5B3A71

0V 000000 FE21D8

-VREF A2EAAE A108DE

> - (VREF + 5%) Error Flag Possible

Table 1. Output coding for the CS5371/72 and digital

filter combination

Note that for a full-scale input signal, 5 V

Output Code

OFST=0 OFST=1

with VREF=2.5 V, the CS5371/72 and CS5376A/78 chipset does not output a maximum 24-bit 2’s complement digital code of 0x7FFFFF, but instead a lower scaled value to allow over-range capability.

7.3. Modulator Sync - MSYNC

To synchronize the analog sampling instant and timing of the digital output bitstream, the CS5371/72 modulators use an MSYNC signal. When using the CS5376A or CS5378 digital filter, MSYNC is automatically generated from a SYNC signal input from the external system.

The MSYNC input is rising edge triggered and resets the internal MCLK counter-divider so the analog sampling instant occurs during a consistent MCLK phase. It also sets the MDATA output timing so the bitstream can be properly sampled by the digital filter input.

7.4. Modulator Flag - MFLAG

The CS5371/72 modulators are 4th order ∆Σ and are therefore conditionally stable. The modulators may go into an oscillatory condition if the analog inputs are over-ranged more than 5% past either positive or negative fullscale.

If an unstable condition is detected, the modulators collapse to a 1st order system until loop stability is

DS255F3 13

CS5371 CS5372

achieved. During this time, the MFLAG pin transitions from low to high to signal an error condition. The analog input signal must be reduced to within the full-scale range for at least 32 MCLK cycles for the modulator to recover from an unstable condition.

The MFLAG output connects to a dedicated input on the digital filter, causing an error bit to be set in the status portion of the digital output data word when detected.

8. POWER MODES

Four power modes are available when using the CS5371/72 modulators. Normal power and low power modes are operational modes, power down and micro-power modes are non-operational standby modes.

8.1. Normal Power Mode

The normal operational mode for the modulators, LPWR=0 and MCLK=2.048 MHz, provides the best performance with power consumption of 25 mW per channel. This power mode is recommended when maximum conversion accuracy is required.

8.2. Low Power Mode - LPWR

The modulators have a low-power operational mode, LPWR=1 and MCLK=1.024 MHz, that reduces power consumption to 15 mW per channel at the expense of 3 dB of dynamic range. This operational mode is recommended when minimizing power is more important than maximizing dynamic range.

When operated with LPWR=1, the modulator sampling clock (MCLK / 4) must be restricted to rates of 256 kHz or less, which requires MCLK to run at

1.024 MHz or less. Operating in low power mode with modulator sample rates greater than 256 kHz will significantly degrade total harmonic distortion performance.

PWDN on the CS5371 and PWDN1, PWDN2 on the CS5372. Note that when the modulators are powered down and MCLK is active, the internal clock generator is still drawing minimal currents.

8.4. Micro-power Mode

Standby power consumption of the modulators can be minimized by placing them into a micro-power mode, PWDN=1 and MCLK=0. Micro-power mode requires setting the PWDN pin and halting MCLK to remove the clock generator input current. Micropower mode consumes only 10 µW of power.

9. POWER SUPPLY

The CS5371/72 modulators have one positive analog power supply pin, VA+, one negative analog power supply pin, VA-, one digital power supply pin, VD, and one digital ground pin, DGND. The analog and digital circuitry is separated internally to enhance performance, therefore power must be supplied to all three supply pins and the digital ground pin must be connected to system ground.

9.1. Power Supply Configurations

The CS5371/72 analog supplies can be powered by a single +5 V supply and analog ground, or by dual supplies of ± 2.5 V. When using dual supplies, the positive and negative analog power supplies must satisfy the following conditions:

(VA+) - (VA-) < 6.8 volts

(VD) - (VA-) < 7.6 volts

These conditions permit several power supply configurations.

 VA+ = +5V; VA- = 0V; VD+ = +3.3V to +5V  VA+ = +2.5V;VA- = -2.5V; VD+ = +3.3V

When used with the CS5376A or CS5378 digital filter the maximum voltage differential between the modulator digital supply, VD, and the CS5376A/78 I/O supply, VDD2 or VDDPAD, must be 0.3V or less.

8.3. Power Down Mode - PWDN

The modulators have a power down mode, PWDN=1 and MCLK=Active, that disables the operation of the selected modulator channel and reduces its power consumption to 1 mW. Each modulator has an independent power down pin,

14 DS255F3

9.2. Power Supply Bypassing

The analog and digital supply pins, VA+, VA-, and VD, should be decoupled to system ground with

0.01 µF and 10 µF capacitors, or with a single

0.1 µF capacitor. Bypass capacitors can be X7R, tantalum, or any other dielectric types.

CS5371 CS5372

9.3. SCR Latch-up Considerations

The VA- pin is tied to the CS5371/72 substrate and should always be connected to the most negative supply voltage to ensure SCR latch-up does not occur. In general, latch-up may occur when any pin voltage (including the analog inputs) is 0.7V or more below VA-, or 7.6V or more above VA-.

Analog inputs INR+/- and INF+/- should be voltage limited to ensure signals don’t exceed the (VA-)-

0.7V or (VA+)+7.6V requirement. Either the inputs should be clamped to the VA+ and VA- rails using reversed biased Schottky diodes (BAT85 or similar), or the current into the analog inputs should be limited to less than 10mA. By current limiting the analog inputs, the internal ESD diodes on the analog input pads will clamp the input signal to the proper level. Input currents greater than 10mA will overdrive the internal diodes, so external components are required.

When using dual analog power supplies, it is recommended to connect the VA- power supply pin to system ground (DGND) using a reversed biased Schottky diode. This configuration clamps the VA-

voltage a maximum of 0.3V above ground to ensure SCR latch-up does not occur during power up. If the VA+ power supply ramps before the VAsupply, the VA- voltage could be pulled above ground through the CS5371/72. If the VA- supply is unintentionally pulled 0.7 V above the DGND pin, SCR latch-up can occur.

9.4. DC-DC Converter Considerations

Many measurement systems are battery powered and utilize DC-DC converters to generate the necessary supply voltages for the system. To minimize the effects of interference, it is desirable to operate the DC-DC converter at a frequency which is rejected by the digital filter.

9.5. Power Supply Rejection

Power supply rejection of the CS5371/72 modulators is frequency dependent. The digital filter rejects power supply noise for frequencies above the filter corner frequency at 130 dB or greater. For frequencies between DC and the digital filter corner frequency, power supply rejection is nearly constant at 90 dB.

DS255F3 15

10. PIN DESCRIPTION - CS5371

CS5371 CS5372

Rough Non-Inverting Input INR+

Fine Non-Inverting Input INF+

Fine Inverting Input INF-

Rough Inverting Input INR-

Positive Voltage Reference Input VREF+

Negative Voltage Reference Input VREF-

Negative Analog Power Supply VA-

Positive Analog Power Supply VA +

No Internal Connection NC

Power Supplies

VA+ _ Positive Analog Power Supply, pin 8

Positive supply voltage.

817

12 13

PWDN Power-down Enable

LPWR Low Power Mode Select

MFLAG Modulator Flag Output

MDATA Modulator Data Output

MSYNC Modulator Sync Input

MCLK Modulator Clock Input

VD Positive Digital Power Supply

DGND Digital Ground

NC No Internal Connection

OFST Offset Mode Select

VD Positive Digital Power Supply

VA- _ Negative Analog Power Supply, pin 7

Negative supply voltage.

VD _ Positive Digital Power Supply, pin 13, 18

Positive supply voltage.

DGND _ Digital Ground, pin 17

Analog Inputs

INR+ _ Rough Non-Inverting Input, pin 1

Rough non-inverting analog input. The rough input settles non-linear currents to improve linearity on the fine input and reduce harmonic distortion.

INR- _ Rough Inverting Input, pin 4

Rough inverting analog input. The rough input settles non-linear currents to improve linearity on the fine input and reduce harmonic distortion.

INF+ _ Fine Non-Inverting Input, pin 2

Fine non-inverting analog input.

16 DS255F3

INF- _ Fine Inverting Input, pin 3

Fine inverting analog input.

VREF+ _ Positive Voltage Reference Input, pin 5

Input for an external +2.5 V voltage reference relative to VREF-.

VREF- _ Negative Voltage Reference Input, pin 6

This pin should be tied to VA-.

Digital Inputs

MCLK _ Modulator Clock Input, pin 19

A CMOS compatible clock input for the modulator internal master clock, nominally 2.048 MHz with an amplitude equal to the VD digital power supply.

MSYNC _ Modulator Sync Input, pin 20

A low to high transition resets the internal clock phasing of the modulator. This assures the sampling instant and modulator data output are synchronous to the external system.

CS5371 CS5372

OFST _ Offset Mode Select, pin 14

When high, adds approximately -50 mV of offset to the analog inputs to guarantee any ∆Σ idle tones are removed. When low, no offset is added.

LPWR _ Low Power Mode Select, pin 23

When set high with MCLK operating at 1.024 MHz, modulator power dissipation is reduced to 15 mW per channel.

PWDN _ Power-down Mode, pin 24

When high, the modulator is in power-down mode and consumes 1 mW. Halting MCLK while in power down mode reduces modulator power dissipation to 10

Digital Outputs

MDATA _ Modulator Data Output, pin 21

Modulator data is output as a 1-bit serial data stream at 512 kHz with an MCLK input of

2.048 MHz. Modulator data is output at 256 kHz with an MCLK input of 1.024 MHz.

MFLAG _ Modulator Flag Output, pin 22

A high level output indicates the modulator is unstable due to an over-range on the analog inputs.

µW.

DS255F3 17

11. PIN DESCRIPTION - CS5372

CS5371 CS5372

Ch. 1 Rough Non-Inverting Input INR1+

Ch. 1 Fine Non-Inverting Input INF1+

Ch. 1 Fine Inverting Input INF1-

Ch. 1 Rough Inverting Input INR1-

Positive Voltage Reference Input VREF+

Negative Voltage Reference Input VREF-

Negative Analog Power Supply VA-

Positive Analog Power Supply VA +

Ch. 2 Rough Inverting Input INR2-

Ch. 2 Fine Inverting Input INF2-

Ch. 2 Fine Non-Inverting Input INF2+

Ch. 2 Rough Non-Inverting Input INR2+

Power Supplies

VA+ _ Positive Analog Power Supply, pin 8

Positive supply voltage.

817

12 13

PWDN1 Ch. 1 Power-down Enable

LPWR Low Power Mode Select

MFLAG1 Ch. 1 Modulator Flag Output

MDATA1 Ch. 1 Modulator Data Output

MSYNC Modulator Sync Input

MCLK Modulator Clock Input

VD Positive Digital Power Supply

DGND Digital Ground

MDATA2 Ch. 2 Modulator Data Output

MFLAG2 Ch. 2 Modulator Flag Output

OFST Offset Mode Select

PWDN2 Ch. 2 Power-down Enable

VA- _ Negative Analog Power Supply, pin 7

Negative supply voltage.

VD _ Positive Digital Power Supply, pin 18

Positive supply voltage.

DGND _ Digital Ground, pin 17

Analog Inputs

INR1+, INR2+ _ Channel 1 & 2 Rough Non-Inverting Inputs, pin 1, 12

Rough non-inverting analog inputs. The rough inputs settle non-linear currents to improve linearity on the fine inputs and reduce harmonic distortion.

INR1-, INR2- _ Channel 1 & 2 Rough Inverting Inputs, pin 4, 9

Rough inverting analog inputs. The rough inputs settle non-linear currents to improve linearity on the fine inputs and reduce harmonic distortion.

INF1+, INF2+ _ Channel 1 & 2 Fine Non-Inverting Input, pin 2, 11

Fine non-inverting analog inputs.

18 DS255F3

INF1-, INF2- _ Channel 1 & 2 Fine Inverting Input, pin 3, 10

Fine inverting analog inputs.

VREF+ _ Positive Voltage Reference Input, pin 5

Input for an external +2.5 V voltage reference relative to VREF-.

VREF- _ Negative Voltage Reference Input, pin 6

This pin should be tied to VA-.

Digital Inputs

MCLK _ Modulator Clock Input, pin 19

A CMOS compatible clock input for the modulator internal master clock, nominally 2.048 MHz with an amplitude equal to the VD digital power supply.

MSYNC _ Modulator Sync Input, pin 20

A low to high transition resets the internal clock phasing of the modulator. This assures the sampling instant and modulator data output are synchronous to the external system.

CS5371 CS5372

OFST _ Offset Mode Select, pin 14

When high, adds approximately -50 mV of offset to the analog inputs to guarantee any ∆Σ idle tones are removed. When low, no offset is added.

LPWR _ Low Power Mode Select, pin 23

When set high with MCLK operating at 1.024 MHz, modulator power dissipation is reduced to 15 mW per channel.

PWDN1, PWDN2 _ Channel 1 & 2 Power-down Mode, pin 24, 13

When high, the modulator is in power down mode and consumes 1 mW. Halting MCLK while in power down mode reduces modulator power dissipation to 10

Digital Outputs

MDATA1, MDATA2 _ Modulator Data Output, pin 21, 16

Modulator data is output as a 1-bit serial data stream at 512 kHz with an MCLK input of

2.048 MHz. Modulator data is output at 256 kHz with an MCLK input of 1.024 MHz.

MFLAG1, MFLAG2 _ Modulator Flag, pin 22, 15

A high level output indicates the modulator is unstable due to an over-range on the analog inputs.

µW.

DS255F3 19

12.PACKAGE DIMENSIONS

24 PIN SSOP PACKAGE DRAWING

CS5371 CS5372

TOP VIEW

INCHES MILLIMETERS

DIM MIN MAX MIN MAX

A -- 0.084 -- 2.13 A1 0.002 0.010 0.05 0.25 A2 0.064 0.074 1.62 1.88

b 0.009 0.015 0.22 0.38 2,3

D 0.311 0.335 7.90 8.50 1

E 0.291 0.323 7.40 8.20 E1 0.197 0.220 5.00 5.60 1

e 0.024 0.027 0.61 0.69

L 0.025 0.040 0.63 1.03

∝

0° 8° 0° 8°

SIDE VIEW

SEATING

PLANE

END VIEW

NOTE

Notes: 1. “D” and “E1” are reference datums and do not included mold flash or protrusions, but do include mold

mismatch and are measured at the parting line, mold flash or protrusions shall not exceed 0.20 mm per side.

2. Dimension “b” does not include dambar protrusion/intrusion. Allowable dambar protrusion shall be

0.13 mm total in excess of “b” dimension at maximum material condition. Dambar intrusion shall not reduce dimension “b” by more than 0.07 mm at least material condition.

3. These dimensions apply to the flat section of the lead between 0.10 and 0.25 mm from lead tips.

20 DS255F3

CS5371 CS5372

13.ORDERING INFORMATION

Model Temperature Package

CS5371-BS

CS5371-BSZ (lead free)

CS5372-BS

CS5372-BSZ (lead free)

14.ENVIRONMENTAL, MANUFACTURING, & HANDLING INFORMATION

Model Number Peak Reflow Temp MSL Rating* Max Floor Life

CS5371-BS

CS5371-BSZ (lead free)

CS5372-BS

CS5372-BSZ (lead free)

* MSL (Moisture Sensitivity Level) as specified by IPC/JEDEC J-STD-020.

-40 to +85 °C 24-pin SSOP

240 °C 2 365 Days

260 °C 3 7 Days

240 °C 2 365 Days

260 °C 3 7 Days

DS255F3 21

CS5371 CS5372

15.REVISION HISTORY

Revision Date Changes

PP2 AUG 2001 Preliminary release, updated with most-current characterization data.

F1 SEP 2005 Fix data sheet errata.

F2 SEP 2005 Corrected Table 1 on Page 13: When OFST=0 the 0V input is 0x000000, when

OFST=1 the 0V input is 0xFE21D8.

F3 OCT 2005 Corrected typical and maximum low-power THD on Page 3.

Corrected maximum input signal frequency on Page 4.

Contacting Cirrus Logic Support

For all product questions and inquiries contact a Cirrus Logic Sales Representative. To find the one nearest to you go to www.cirrus.com

IMPORTANT NOTICE

Cirrus Logic, Inc. and its subsidiaries (“Cirrus”) believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided “AS IS” without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.

CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED FOR USE IN AIRCRAFT SYSTEMS, MILITARY APPLICATIONS, PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PRODUCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER'S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE CUSTOMER OR CUSTOMER'S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES, BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL LIABILITY, INCLUDING ATTORNEYS' FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES.

Cirrus Logic, Cirrus, and the Cirrus Logic logo designs are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be trademarks or service marks of their respective owners.

22 DS255F3

Cirrus Logic CS5372 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Features & Description

1. CHARACTERISTICS & SPECIFICATIONS

ANALOG CHARACTERISTICS Notes:T

DIGITAL CHARACTERISTICS Notes:T

ABSOLUTE MAXIMUM RATINGS Notes:DGND = 0 V

SWITCHING CHARACTERISTICS Notes:T

2. GENERAL DESCRIPTION.

3.1. Full-scale Signal Performance

3.2. Noise Performance

4. SIGNAL INPUTS

4.1. Differential Inputs - INR+/-, INF+/-

4.2. Anti-alias Filters

4.3. Input Impedance

4.4. Maximum Signal Levels

5. INPUT OFFSET

5.1. Offset Enable - OFST

5.2. Offset Drift

6. VOLTAGE REFERENCE INPUTS

6.1. Voltage Reference Configurations

6.2. VREF Input Impedance

6.3. Gain Accuracy

6.4. Gain Drift

7. DIGITAL FILTER INTERFACE

7.1. Modulator Clock - MCLK

7.2. Modulator Data - MDATA

7.3. Modulator Sync - MSYNC

7.4. Modulator Flag - MFLAG

8. POWER MODES

8.1. Normal Power Mode

8.2. Low Power Mode - LPWR

8.4. Micro-power Mode

9. POWER SUPPLY

9.1. Power Supply Configurations

8.3. Power Down Mode - PWDN

9.2. Power Supply Bypassing

9.3. SCR Latch-up Considerations

9.4. DC-DC Converter Considerations

9.5. Power Supply Rejection

10. PIN DESCRIPTION - CS5371

11. PIN DESCRIPTION - CS5372

12.PACKAGE DIMENSIONS

13.ORDERING INFORMATION

14.ENVIRONMENTAL, MANUFACTURING, & HANDLING INFORMATION

15.REVISION HISTORY