Linear Technology LTC1606 Datasheet

FEATURES

Final Electrical Specifications

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Sample Rate: 250ksps

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Single 5V Supply

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Bipolar Input Range: ±10V

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Signal-to-Noise Ratio: 90dB Typ

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Power Dissipation: 75mW Typ

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Integral Nonlinearity: ±2.0LSB Max

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Guaranteed No Missing Codes

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Operates with Internal or External Reference

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Internal Synchronized Clock

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28-Pin SSOP Package

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Improved 2nd Source to AD976A and ADS7805

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APPLICATIONS

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Industrial Process Control

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Multiplexed Data Acquisition Systems

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High Speed Data Acquisition for PCs

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Digital Signal Processing

LTC1606

16-Bit, 250ksps,

Single Supply ADC

March 2000

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DESCRIPTION

The LTC®1606 is a 250ksps, sampling 16-bit A/D con­verter that draws only 75mW (typical) from a single 5V
supply. This easy-to-use device includes sample-and­hold, precision reference, switched capacitor successive
approximation A/D and trimmed internal clock.

The LTC1606’s input range is an industry standard ±10V.
Maximum DC specs include ±2.0LSB INL and 16 bits no
missing codes over temperature. An external reference
can be used if greater accuracy over temperature is
needed.

The 90dB signal-to-noise ratio offers an improvement of
3dB over competing devices, and the RMS transition noise
is reduced (0.65LSB vs 1LSB) relative to competitive
parts.

The ADC has a microprocessor compatible, 16-bit or two
byte parallel output port. A convert start input and a data
ready signal (BUSY) ease connections to FIFOs, DSPs and
microprocessors.

, LTC and LT are registered trademarks of Linear Technology Corporation.

±10V

INPUT

Low Power, 250kHz, 16-Bit Sampling ADC on 5V Supply

5V

6 TO 13

15 TO 22

26

25

24

23

10µF

DIGITAL
CONTROL
SIGNALS

28 27

V

DIGVANA

200Ω

1

33.2k

4

4.096V

10µF

3

2.5V

2.2µF

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen­tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

V

CAP

REF

7.35k

IN

2.5k 9k

1.64x
BUFFER

4k

REFERENCE

AGND1

AGND25DGND

2

16-BIT

SAMPLING ADC

CONTROL

LOGIC AND

TIMING

14

D15 TO D0

BUSY

CS

R/C

BYTE

1606 TA01

0.1µF

16-BIT
OR 2 BYTE
PARALLEL
BUS

1

LTC1606

W

O

A

(Notes 1, 2)

V

ANA

V

DIG

V

DIG

LUTEXI TIS

S

.......................................................................... 7V

to V

........................................................... 0.3V

ANA

........................................................................... 7V

A

WUW

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ARB

G

Ground Voltage Difference

DGND, AGND1 and AGND2 .............................. ±0.3V

Analog Inputs (Note 3)

VIN..................................................................... ±25V

CAP ............................ V

+ 0.3V to AGND2 – 0.3V

ANA

REF....................................Indefinite Short to AGND2

Momentary Short to V

Digital Input Voltage (Note 4) ........ V

Digital Output Voltage........ V

– 0.3V to V

DGND

– 0.3V to 10V

DGND

DIG

ANA

+ 0.3V

Power Dissipation.............................................. 500mW

Operating Ambient Temperature Range

LTC1606AC/LTC1606C............................0°C to 70°C

LTC1606AI/LTC1606I ......................... – 40°C to 85°C

Storage Temperature Range ................. –65°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300°C

/

PACKAGE

V

IN

AGND1

REF

CAP

AGND2

D15 (MSB)

D14
D13
D12
D11
D10

D9
D8

DGND

Consult factory for Military grade parts.

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RDER I FOR ATIO

TOP VIEW

1
2
3
4
5
6
7
8

9
10
11
12
13
14

G PACKAGE

28-LEAD PLASTIC SSOP

T

= 125°C, θJA = 95°C/W

JMAX

28
27
26
25
24
23
22
21
20
19
18
17
16
15

V

DIG

V

ANA

BUSY
CS
R/C
BYTE
D0
D1
D2
D3
D4
D5
D6
D7

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ORDER PART

NUMBER

LTC1606ACG
LTC1606AIG
LTC1606CG
LTC1606IG

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CONVERTER CHARACTERISTICS

temperature range, otherwise specifications are at TA = 25°C. (Notes 5, 6)

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

Resolution ● 16 16 Bits
No Missing Codes ● 15 16 Bits
Transition Noise 0.65 0.65 LSB
Integral Linearity Error (Note 7) ● ±3 ±2 LSB
Bipolar Zero Error Ext. Reference = 2.5V (Note 8) ● ±10 ±10 mV
Bipolar Zero Error Drift ±2 ±2 ppm/°C
Full-Scale Error Drift ±7 ±5 ppm/°C
Full-Scale Error Ext. Reference = 2.5V (Notes 12, 13) ● ±0.50 ±0.25 %
Full-Scale Error Drift Ext. Reference = 2.5V ±2 ±2 ppm/°C
Power Supply Sensitivity

= V

DIG

= V

DD

V

ANA

VDD = 5V ±5% (Note 9) ±8 ±8 LSB

The ● indicates specifications which apply over the full operating

LTC1606 LTC1606A

RMS

2

LTC1606

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ANALOG INPUT

specifications are at TA = 25°C. (Note 5)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

IN

C

IN

R

IN

Analog Input Range (Note 9) 4.75V ≤ V
Analog Input Capacitance 10 pF
Analog Input Impedance 10 kΩ

The ● indicates specifications which apply over the full operating temperature range, otherwise

LTC1606/LTC1606A

≤ 5.25V, 4.75V ≤ V

ANA

≤ 5.25V ● ±10 V

DIG

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DYNAMIC ACCURACY

SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

S/(N + D) Signal-to-(Noise + Distortion) Ratio 1kHz Input Signal (Note 14) 90 90 dB

THD Total Harmonic Distortion 1kHz Input Signal, First 5 Harmonics –102 – 102 dB

Peak Harmonic or Spurious Noise 1kHz Input Signal –102 –102 dB

Full-Power Bandwidth (Note 15) 275 275 kHz
Aperture Delay 40 40 ns
Aperture Jitter Sufficient to Meet AC Specs Sufficient to Meet AC Specs
Transient Response Full-Scale Step (Note 9) 2 2 µs
Overvoltage Recovery (Note 16) 150 150 ns

(Notes 5, 14)

LTC1606 LTC1606A

10kHz Input Signal 90 87 90 dB
20kHz, –60dB Input Signal 30 30 dB

10kHz Input Signal, First 5 Harmonics –94 –89 – 94 dB

10kHz Input Signal –94 –94 dB

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INTERNAL REFERENCE CHARACTERISTICS

operating temperature range, otherwise specifications are at TA = 25°C. (Note 5)

PARAMETER CONDITIONS MIN TYP MAX UNITS

V

Output Voltage I

REF

V

Output Tempco I

REF

Internal Reference Source Current 1 µA
External Reference Voltage for Specified Linearity (Notes 9, 10) 2.30 2.50 2.70 V
External Reference Current Drain Ext. Reference = 2.5V (Note 9) ● 100 µA
CAP Output Voltage I

= 0 ● 2.470 2.500 2.520 V

OUT

= 0 ±5 ppm/°C

OUT

= 0 4.096 V

OUT

The ● indicates specifications which apply over the full

LTC1606/LTC1606A

3

LTC1606

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DIGITAL INPUTS AND DIGITAL OUTPUTS

operating temperature range, otherwise specifications are at TA = 25°C. (Note 5)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

IH

V

IL

I

IN

C

IN

V

OH

V

OL

I

OZ

C

OZ

I

SOURCE

I

SINK

High Level Input Voltage VDD = 5.25V ● 2.4 V
Low Level Input Voltage VDD = 4.75V ● 0.8 V
Digital Input Current VIN = 0V to V
Digital Input Capacitance 5pF
High Level Output Voltage VDD = 4.75V IO = –10µA 4.5 V

Low Level Output Voltage VDD = 4.75V IO = 160µA 0.05 V

Hi-Z Output Leakage D15 to D0 V
Hi-Z Output Capacitance D15 to D0 CS High (Note 9) ● 15 pF
Output Source Current V
Output Sink Current V

OUT

OUT

OUT

DD

= 0V to VDD, CS High ● ±10 µA

= 0V –10 mA
= V

DD

The ● indicates specifications which apply over the full

LTC1606/LTC1606A

● ±10 µA

IO = –200µA ● 4.0 V

IO = 1.6mA ● 0.10 0.4 V

10 mA

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TIMING CHARACTERISTICS

range, otherwise specifications are at TA = 25°C. (Note 5)

The ● indicates specifications which apply over the full operating temperature

LTC1606/LTC1606A

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

f

SAMPLE(MAX)

t

CONV

t

ACQ

t

1

t

2

t

3

t

4

t

5

t

6

t

7

t

8

t

9

t

10

t

11

t

12

Maximum Sampling Frequency ● 250 kHz
Conversion Time ● 2.5 µs
Acquisition Time ● 1.5 µs
Convert Pulse Width (Note 11) ● 40 ns
Data Valid Delay After R/C↓ (Note 9) ● 2.5 µs
BUSY Delay from R/C↓ CL = 30pF ● 65 ns
BUSY Low ● 2.5 µs
BUSY Delay After End of Conversion 100 ns
Aperture Delay 40 ns
Bus Relinquish Time ● 15 50 ns
BUSY Delay After Data Valid ● 20 90 ns
Previous Data Valid After R/C↓ 2 µs
R/C to CS Setup Time (Notes 9, 10) ● 5ns
Time Between Conversions ● 4 µs
Bus Access CL = 30pF, (Notes 10) ● 15 60 ns
Byte Delay CL = 30pF, (Notes 9, 10) ● 15 60 ns

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