MAXIM MAX1196 User Manual

General Description

The MAX1196 is a 3V, dual 8-bit analog-to-digital converter (ADC) featuring fully differential wideband trackand-hold (T/H) inputs, driving two ADCs. The MAX1196 is optimized for low power, small size, and high-dynamic performance for applications in imaging, instrumentation, and digital communications. This ADC operates from a single 2.7V to 3.6V supply, consuming only 87mW while delivering a typical signal-to-noise and distortion (SINAD) of 48.4dB at an input frequency of 20MHz and a sampling rate of 40Msps. The T/H driven input stages incorporate 400MHz (-3dB) input amplifiers. The converters can also be operated with singleended inputs. In addition to low operating power, the MAX1196 features a 3mA sleep mode as well as a

0.1µA power-down mode to conserve power during idle periods.

An internal 2.048V precision bandgap reference sets the full-scale range of the ADC. A flexible reference structure allows the use of this internal or an externally applied reference, if desired for applications requiring increased accuracy or a different input voltage range.

The MAX1196 features parallel, multiplexed, CMOScompatible three-state outputs. The digital output format can be set to two’s complement or straight offset binary through a single control pin. The device provides for a separate output power supply of 1.7V to 3.6V for flexible interfacing. The MAX1196 is available in a 7mm × 7mm, 48-pin TQFP package, and is specified for the extended industrial (-40°C to +85°C) temperature range.

Pin-compatible, nonmultiplexed higher speed versions of the MAX1196 are also available. Refer to the MAX1198 data sheet for 100Msps, the MAX1197 data sheet for 60Msps, and the MAX1195 data sheet for 40Msps.

For a 10-bit, pin-compatible upgrade, refer to the MAX1186 data sheet. With the N.C. pins of the MAX1196 internally pulled down to ground, this ADC becomes a drop-in replacement for the MAX1186.

Applications

Baseband I/Q Sampling

Multichannel IF Sampling

Ultrasound and Medical Imaging

Battery-Powered Instrumentation

WLAN, WWAN, WLL, MMDS Modems

Set-Top Boxes

VSAT Terminals

Features

♦ Single 2.7V to 3.6V Operation

♦ Excellent Dynamic Performance

48.4dB/44.7dB SINAD at fIN= 20MHz/200MHz

68.9dB/53dBc SFDR at fIN= 20MHz/200MHz

♦ -72dB Interchannel Crosstalk at fIN= 20MHz

♦ Low Power

87mW (Normal Operation) 9mW (Sleep Mode)

0.3µW (Shutdown Mode)

♦ 0.05dB Gain and ±0.05° Phase Matching ♦ Wide ±1V

P-P

Differential Analog Input Voltage

Range

♦ 400MHz -3dB Input Bandwidth

♦ On-Chip 2.048V Precision Bandgap Reference

♦ User-Selectable Output Format—Two’s

Complement or Offset Binary

♦ Pin-Compatible 8-Bit and 10-Bit Upgrades

Available

MAX1196

Dual 8-Bit, 40Msps, 3V, Low-Power ADC with

Internal Reference and Multiplexed Parallel Outputs

________________________________________________________________ Maxim Integrated Products 1

N.C. N.C. OGND OV

OGND A/B N.C. N.C. N.C. N.C. N.C.

COM

GND INA+ INA-

GND INBINB+ GND

CLK

TQFP-EP

MAX1196

GND

DDVDD

GND

T/B

SLEEP

N.C.

1314151617181920212223

4847464544434241403938

REFN

REFP

REFIN

REFOUT

D7A/B

D6A/B

D5A/B

D4A/B

D3A/B

D2A/B

D1A/B

D0A/B

Pin Configuration

Ordering Information

19-2600; Rev 0; 9/02

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

*EP = Exposed pad.

Functional Diagram appears at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX1196ECM -40°C to +85°C 48 TQFP-EP*

MAX1196

Dual 8-Bit, 40Msps, 3V, Low-Power ADC with Internal Reference and Multiplexed Parallel Outputs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= OVDD= 3V, 0.1µF and 2.2µF capacitors from REFP, REFN, and COM to GND; REFOUT connected to REFIN through a 10kΩ resistor, V

= 2V

P-P

(differential with respect to COM), CL= 10pF at digital outputs (Note 5), f

CLK

= 40MHz, TA= T

MIN

to T

MAX

unless otherwise noted. ≥+25°C guaranteed by production test, <+25°C guaranteed by design and characterization. Typical values are at T

= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

VDD, OVDDto GND .............................................. -0.3V to +3.6V

OGND to GND...................................................... -0.3V to +0.3V

INA+, INA-, INB+, INB- to GND ...............................-0.3V to V

REFIN, REFOUT, REFP, REFN, COM,

CLK to GND............................................-0.3V to (V

+ 0.3V)

OE, PD, SLEEP, T/B,

D7A/B–D0A/B, A/B to OGND...............-0.3V to (OV

+ 0.3V)

Continuous Power Dissipation (T

= +70°C)

48-Pin TQFP (derate 12.5mW/°C above +70°C)........1000mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-60°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER

CONDITIONS

UNITS

DC ACCURACY

Resolution 8 Bits

Integral Nonlinearity INL fIN = 7.51MHz (Note 1)

±1 LSB

Differential Nonlinearity DNL

= 7.51MHz, no missing codes

guaranteed (Note 1)

±1 LSB

Offset Error ±4

%FS

Gain Error ±4

%FS

Gain Temperature Coefficient

ppm/°C

ANALOG INPUT

Differential Input Voltage Range

DIFF

Differential or single-ended inputs

Common-Mode Input Voltage Range

Input Resistance R

Switched capacitor load

kΩ

Input Capacitance C

5pF

CONVERSION RATE

Maximum Clock Frequency f

CLK

MHz

CHA 5

Data Latency

CHB 5.5

Clock

Cycles

DYNAMIC CHARACTERISTICS (f

CLK

= 40MHz)

INA or B

= 2MHz at -1dB FS

INA or B

= 7.5MHz at -1dB FS

INA or B

= 20MHz at -1dB FS

Signal-to-Noise Ratio SNR

INA or B

= 101MHz at -1dB FS 48

INA or B

= 2MHz at -1dB FS

INA or B

= 7.5MHz at -1dB FS

INA or B

= 20MHz at -1dB FS 47

Signal-to-Noise and Distortion SINAD

INA or B

= 101MHz at -1dB FS 48

SYMBOL

MIN TYP MAX

±0.3

±0.15

±100

±1.0

VDD / 2

± 0.2

140

48.7

47.5 48.5

48.6

48.7

48.4

MAX1196

Dual 8-Bit, 40Msps, 3V, Low-Power ADC with

Internal Reference and Multiplexed Parallel Outputs

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= OVDD= 3V, 0.1µF and 2.2µF capacitors from REFP, REFN, and COM to GND; REFOUT connected to REFIN through a 10kΩ resistor, V

= 2V

P-P

(differential with respect to COM), CL= 10pF at digital outputs (Note 5), f

CLK

= 40MHz, TA= T

MIN

to T

MAX

unless otherwise noted. ≥+25°C guaranteed by production test, <+25°C guaranteed by design and characterization. Typical values are at T

= +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

INA or B

= 2MHz at -1dB FS 69

INA or B

= 7.5MHz at -1dB FS 70

INA or B

= 20MHz at -1dB FS 60

Spurious-Free Dynamic Range SFDR

INA or B

= 101MHz at -1dB FS 65

dBc

INA or B

= 2MHz at -1dB FS -72

INA or B

= 7.5MHz at -1dB FS

INA or B

= 20MHz at -1dB FS -75

Third-Harmonic Distortion HD3

INA or B

= 101MHz at -1dB FS -67

dBc

IN1(A or B)

= 1.997MHz at -7dB FS,

Intermodulation Distortion

( Fir st Fi ve Od d- Or der IM D s) ( N ote 2)

IMD

IN2(A or B)

= 2.046MHz at -7dB FS

-68

dBc

IN1(A or B)

= 1.997MHz at -7dB FS,

Third-Order Intermodulation Distortion (Note 2)

IM3

IN2(A or B)

= 2.046MHz at -7dB FS

dBc

INA or B

= 2MHz at -1dB FS -70

INA or B

= 7.5MHz at -1dB FS -69

INA or B

= 20MHz at -1dB FS -69 -57

Total Harmonic Distortion (First Four Harmonics)

THD

INA or B

= 101MHz at -1dB FS -63

dBc

Small-Signal Bandwidth Input at -20dB FS, differential inputs

Full-Power Bandwidth FPBW Input at -1dB FS, differential inputs

IN1(A or B)

= 106MHz at -1dB FS,

Gain Flatness (12MHz Spacing) (Note 3)

IN2(A or B)

= 118MHz at -1dB FS

Aperture Delay t

1ns

Aperture Jitter t

1dB SNR degradation at Nyquist 2

Overdrive Recovery Time For 1.5 × full-scale input 2 ns INTERNAL REFERENCE (REFIN = REFOUT through 10kΩ resistor; REFP, REFN, and COM levels are generated internally.)

Reference Output Voltage

(Note 4)

Positive Reference Output Voltage

REFP

(Note 5)

Negative Reference Output Voltage

REFN

(Note 5)

Common-Mode Level V

COM

(Note 5)

Differential Reference Output Voltage Range

∆V

REF

∆V

REF

= V

REFP

- V

REFN

Reference Temperature Coefficient

REF

REFOUT

68.9

-73.7

-73.2

500 MHz

400 MHz

0.05

2.048

±3%

2.012

0.988

VDD / 2

± 0.1

1.024

±3%

RMS

±100 ppm/°C

MAX1196

Dual 8-Bit, 40Msps, 3V, Low-Power ADC with Internal Reference and Multiplexed Parallel Outputs

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VDD= OVDD= 3V, 0.1µF and 2.2µF capacitors from REFP, REFN, and COM to GND; REFOUT connected to REFIN through a 10kΩ resistor, V

= 2V

P-P

(differential with respect to COM), CL= 10pF at digital outputs (Note 5), f

CLK

= 40MHz, TA= T

MIN

to T

MAX

unless otherwise noted. ≥+25°C guaranteed by production test, <+25°C guaranteed by design and characterization. Typical values are at T

= +25°C.)

PARAMETER

CONDITIONS

BUFFERED EXTERNAL REFERENCE (V

REFIN

= 2.048V)

Positive Reference Output Voltage

REFP

(Note 5)

Negative Reference Output Voltage

REFN

(Note 5)

Common-Mode Level V

COM

(Note 5)

Differential Reference Output Voltage Range

∆V

REF

∆V

REF

= V

REFP

- V

REFN

REFIN Resistance R

REFIN

MΩ

Maximum REFP, COM Source Current

5mA

Maximum REFP, C OM S i nk C ur r ent I

SINK

µA

Maximum REFN Source Current

µA

Maximum REFN Sink Current I

SINK

-5 mA

UNBUFFERED EXTERNAL REFERENCE (V

REFIN

= AGND, reference voltage applied to REFP, REFN, and COM)

REFP, REFN Input Resistance

REFP

REFN

Measured between REFP and REFN 4 kΩ

REFP, REFN, COM Input Capacitance

15 pF

Differential Reference Input Voltage Range

∆V

REF

∆V

REF

= V

REFP

- V

REFN

COM Input Voltage Range V

COM

VDD / 2

REFP Input Voltage V

REFP

C OM

REFN Input Voltage V

REFN

COM

DIGITAL INPUTS (CLK, PD, OE, SLEEP, T/B)

CLK

0.8 ×

Input High Threshold V

PD, OE, SLEEP, T/B

0.8 ×

CLK

0.2 ×

Input Low Threshold V

PD, OE, SLEEP, T/B

0.2 ×

SYMBOL

MIN TYP MAX UNITS

SOURCE

∆V

2.012

0.988

VDD / 2

±0.1

1.024

±2%

>50

-250

250

1.024

±10%

±5%

∆V

RE F

REF

/ 2

MAX1196

Dual 8-Bit, 40Msps, 3V, Low-Power ADC with

Internal Reference and Multiplexed Parallel Outputs

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

(VDD= OVDD= 3V, 0.1µF and 2.2µF capacitors from REFP, REFN, and COM to GND; REFOUT connected to REFIN through a 10kΩ resistor, V

= 2V

P-P

(differential with respect to COM), CL= 10pF at digital outputs (Note 5), f

CLK

= 40MHz, TA= T

MIN

to T

MAX

unless otherwise noted. ≥+25°C guaranteed by production test, <+25°C guaranteed by design and characterization. Typical values are at T

= +25°C.)

PARAMETER

CONDITIONS

UNITS

Input Hysteresis V

HYST

VIH = VDD = OV

Input Leakage

VIL = 0

µA

Input Capacitance C

5pF

DIGITAL OUTPUTS (D0A/B–D7A/B, A/B)

Output Voltage Low V

SINK

= -200µA 0.2 V

Output Voltage High V

SOURCE

= 200µA

0.2

Three-State Leakage Current I

LEAK

OE = OV

±10 µA

Three-State Output Capacitance

OUT

OE = OV

5pF

POWER REQUIREMENTS

Analog Supply Voltage Range V

2.7 3 3.6 V

Output Supply Voltage Range OV

1.7 3 3.6 V

Operating, f

INA&B

= 20MHz at -1dB FS

applied to both channels

29 36

Sleep mode 3

Analog Supply Current I

VDD

Shutdown, clock idle, PD = OE = OV

0.1 20 µA

Operating, f

INA&B

= 20MHz at -1dB FS

applied to both channels (Note 6)

8mA

Sleep mode 3

Output Supply Current I

OVDD

Shutdown, clock idle, PD = OE = OV

310

µA

Operating, f

INA&B

= 20MHz at -1dB FS

applied to both channels

87 108

Sleep mode 9

Analog Power Dissipation PDISS

Shutdown, clock idle, PD = OE = OV

0.3 60 µW

Offset, VDD ±5% ±3

Power-Supply Rejection PSRR

Gain, V

±5% ±3

mV/V

TIMING CHARACTERISTICS

CLK Rise to CHA Output Data Valid

DOA

CL = 20pF (Notes 1, 7) 6

CLK Fall to CHB Output Data Valid

DOB

CL = 20pF (Notes 1, 7) 6

Clock Rise/Fall to A/B Rise/Fall Time

DA/B

6ns

OE Fall to Output Enable Time

5ns

OE Rise to Output Disable Time

5ns

CLK Pulse Width High t

Clock period: 25ns (Note 7)

12.5 ns

SYMBOL

MIN TYP MAX

ENABLE

DISABLE

0.15

±1.5

±20 ±20

8.25

MAX1196

Dual 8-Bit, 40Msps, 3V, Low-Power ADC with Internal Reference and Multiplexed Parallel Outputs

6 _______________________________________________________________________________________

Note 1: Guaranteed by design. Not subject to production testing. Note 2: Intermodulation distortion is the total power of the intermodulation products relative to the total input power. Note 3: Analog attenuation is defined as the amount of attenuation of the fundamental bin from a converted FFT between two

applied input signals with the same magnitude (peak-to-peak) at f

IN1

and f

IN2

Note 4: REFIN and REFOUT should be bypassed to GND with a 0.1µF (min) and 2.2µF (typ) capacitor. Note 5: REFP, REFN, and COM should be bypassed to GND with a 0.1µF (min) and 2.2µF (typ) capacitor. Note 6: Typical digital output current at f

INA&B

= 20MHz. For digital output currents vs. analog input frequency, see the Typical

Operating Characteristics.

Note 7: See Figure 3 for detailed system timing diagrams. Clock to data valid timing is measured from 50% of the clock level to

50% of the data output level.

Note 8: SINAD settles to within 0.5dB of its typical value in unbuffered external reference mode. Note 9: Crosstalk rejection is tested by applying a test tone to one channel and holding the other channel at DC level. Crosstalk is

measured by calculating the power ratio of the fundamental of each channel’s FFT.

Note 10:Amplitude matching is measured by applying the same signal to each channel and comparing the magnitude of the funda-

mental of the calculated FFT.

Note 11:Phase matching is measured by applying the same signal to each channel and comparing the phase of the fundamental of

the calculated FFT. The data from both ADC channels must be captured simultaneously during this test.

ELECTRICAL CHARACTERISTICS (continued)

(VDD= OVDD= 3V, 0.1µF and 2.2µF capacitors from REFP, REFN, and COM to GND; REFOUT connected to REFIN through a 10kΩ resistor, V

= 2V

P-P

(differential with respect to COM), CL= 10pF at digital outputs (Note 5), f

CLK

= 40MHz, TA= T

MIN

to T

MAX

unless otherwise noted. ≥+25°C guaranteed by production test, <+25°C guaranteed by design and characterization. Typical values are at T

= +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

CLK Pulse Width Low t

Clock period: 25ns (Note 7)

12.5 ns

Wake-up from sleep mode 1

Wake-Up Time t

WAKE

Wake-up from shutdown mode (Note 8) 20

µs

CHANNEL-TO-CHANNEL MATCHING

Crosstalk f

INA or B

= 20MHz at -1dB FS (Note 9) -72 dB

Gain Matching f

INA or B

= 20MHz at -1dB FS (Note 10)

Phase Matching f

INA or B

= 20MHz at -1dB FS (Note 11)

D eg r ees

±1.5

0.05

±0.05

MAX1196

Dual 8-Bit, 40Msps, 3V, Low-Power ADC with

Internal Reference and Multiplexed Parallel Outputs

_______________________________________________________________________________________ 7

Typical Operating Characteristics

(VDD= OVDD= 3V, V

REFIN

= 2.048V, differential input at -1dB FS, f

CLK

= 40MHz, CL≈ 10pF, TA= +25°C, unless otherwise noted.)

FFT PLOT CHA

(DIFFERENTIAL INPUT, 8192-POINT DATA RECORD)

MAX1196-01

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dB)

181612 144 6 8 102

-80

-70

-60

-50

-40

-30

-20

-10

-90 020

INA

CLK

= 40.0005678MHz

INA

= 1.958036MHz

INB

= 7.534287MHz AINA = AINB = -1dB FS COHERENT SAMPLING

INB

HD2

HD3

FFT PLOT CHB

(DIFFERENTIAL INPUT, 8192-POINT DATA RECORD)

MAX1196-02

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dB)

181612 144 6 8 102

-80

-70

-60

-50

-40

-30

-20

-10

-90 020

INA

CLK

= 40.0005678MHz

INA

= 1.958036MHz

INB

= 7.534287MHz AINA = AINB = -1dB FS COHERENT SAMPLING

INB

HD2

HD3

FFT PLOT CHA

(DIFFERENTIAL INPUT, 8192-POINT DATA RECORD)

MAX1196-03

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dB)

181612 144 6 8 102

-80

-70

-60

-50

-40

-30

-20

-10

-90 020

INA

CLK

= 40.0005678MHz

INA

= 7.534287MHz

INB

= 1.958036MHz AINA = AINB = -1dB FS COHERENT SAMPLING

INB

HD2

HD3

FFT PLOT CHB

(DIFFERENTIAL INPUT, 8192-POINT DATA RECORD)

MAX1196-04

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dB)

181612 144 6 8 102

-80

-70

-60

-50

-40

-30

-20

-10

-90 020

INA

CLK

= 40.0005678MHz

INA

= 7.534287MHz

INB

= 1.958036MHz AINA = AINB = -1dB FS COHERENT SAMPLING

INB

HD2

HD3

FFT PLOT CHA

(DIFFERENTIAL INPUT, 8192-POINT DATA RECORD)

MAX1196-05

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dB)

181612 144 6 8 102

-80

-70

-60

-50

-40

-30

-20

-10

-90 020

INA

CLK

= 40.0005678MHz

INA

= 19.88798MHz

INB

= 40.49374MHz AINA = AINB = -1dB FS COHERENT SAMPLING

INB

HD2

HD3

FFT PLOT CHB

(DIFFERENTIAL INPUT, 8192-POINT DATA RECORD)

MAX1196-06

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dB)

181612 144 6 8 102

-80

-70

-60

-50

-40

-30

-20

-10

-90 020

INA

CLK

= 40.0005678MHz

INA

= 19.88798MHz

INB

= 40.49374MHz AINA = AINB = -1dB FS COHERENT SAMPLING

INB

HD2

HD3

FFT PLOT CHA

(DIFFERENTIAL INPUT, 8192-POINT DATA RECORD)

MAX1196-07

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dB)

181612 144 6 8 102

-80

-70

-60

-50

-40

-30

-20

-10

-90 020

INA

CLK

= 40.0005678MHz

INA

= 40.49374MHz

INB

= 19.88798MHz AINA = AINB = -1dB FS COHERENT SAMPLING

INB

HD2

HD3

FFT PLOT CHB

(DIFFERENTIAL INPUT, 8192-POINT DATA RECORD)

MAX1196-08

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dB)

181612 144 6 8 102

-80

-70

-60

-50

-40

-30

-20

-10

-90 020

INA

CLK

= 40.0005678MHz

INA

= 40.49374MHz

INB

= 19.88798MHz AINA = AINB = -1dB FS COHERENT SAMPLING

INB

HD2

HD3

TWO-TONE IMD PLOT

(DIFFERENTIAL INPUT, 8192-POINT DATA RECORD)

MAX1196-09

ANALOG INPUT FREQUENCY (MHz)

AMPLITUDE (dB)

4.54.03.0 3.51.5 2.0 2.51.0

-80

-70

-60

-50

-40

-30

-20

-10

-90

0.5 5.0

CLK

= 40.001536MHz

INA

= 1.997147MHz

INB

= 2.045977MHz AIN = -7dB FS COHERENT SAMPLING

IN2

IN1

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