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AD7703

LC2MOS 20-Bit A/D Converter

Analog Devices 

AD7703–SPECIFICATIONS (TA = 25؇C; AVDD = DVDD = +5 V; AVSS = DVSS = –5 V; VREF = +2.5 V; fCLKIN = 4.096 MHz;

BP/UP = +5 V; MODE = +5 V; AIN Source Resistance = 1 k⍀1 with 1 nF to AGND at AIN; unless otherwise noted.)

Parameter

A/S Version2

B Version2

C Version2

Unit

Test Conditions/Comments

STATIC PERFORMANCE

Resolution

Integral Nonlinearity, TMIN to TMAX

25°C

TMIN to TMAX

Differential Nonlinearity, TMIN to TMAX

Positive Full-Scale Error3

Full-Scale Drift4

Unipolar Offset Error3

Unipolar Offset Drift4

Bipolar Zero Error3

Bipolar Zero Drift4

Bipolar Negative Full-Scale Errors3

Bipolar Negative Full-Scale Drift4

Noise (Referred to Output)

20

±0.0015

±0.003

±0.003

±0.5

±4

±16

±19/±37

±4

±16

±26

±67 +48/–400

±4

±16

±13

±34 +24/–200

±8

±32

±10/±20

1.6

20

±0.0007

±0.0015

±0.0015

±0.5

±4

±16

±19

±4

±16

±26

±67

±4

±16

±13

±34

±8

±32

±10

1.6

20

±0.0003

±0.0008

±0.0012

±0.5

±4

±16

±19

±4

±16

±26

±67

±4

±16

±13

±34

±8

±32

±10

1.6

Bits

% FSR typ

% FSR max

% FSR max

LSB typ

LSB typ

LSB max

LSB typ

LSB typ

LSB max

LSB typ

LSB typ

LSB typ

LSB max

LSB typ

LSB typ

LSB typ

LSB max

LSB typ

LSB rms typ

Guaranteed No Missing Codes

Temp Range: 0°C to +70°C

Specified Temp Range

Temp Range: 0°C to +70°C

Specified Temp Range

DYNAMIC PERFORMANCE

Sampling Frequency, fS

fCLKIN/256

fCLKIN/256

fCLKIN/256

Hz

Output Update Rate, fOUT

fCLKIN/1024

fCLKIN/1024

fCLKIN/1024

Hz

Filter Corner Frequency, f–3 dB

fCLKIN/409,600

fCLKIN/409,600

fCLKIN/409,600

Hz

Settling Time to ±0.0007% FS

507904/fCLKIN

507904/fCLKIN

507904/fCLKIN

sec

SYSTEM CALIBRATION

Positive Full-Scale Calibration Range

Positive Full-Scale Overrange

Negative Full-Scale Overrange

Maximum Offset Calibration Ranges5, 6

Unipolar Input Range

Bipolar Input Range

Input Span7

VREF + 0.1

VREF + 0.1

–(VREF + 0.1)

–(VREF + 0.1)

–0.4 VREF to +0.4 VREF

0.8 VREF

2 VREF + 0.2

VREF + 0.1

VREF + 0.1

–(VREF + 0.1)

–(VREF + 0.1)

–0.4 VREF to +0.4 VREF

0.8 VREF

2 VREF + 0.2

VREF + 0.1

VREF + 0.1

–(VREF + 0.1)

–(VREF + 0.1)

–0.4 VREF to +0.4 VREF

0.8 VREF

2 VREF + 0.2

V max

V max

V max

V max

V max

V min

V max

ANALOG INPUT

Unipolar Input Range

Bipolar Input Range

Input Capacitance

Input Bias Current1

0 to 2.5

±2.5

20

1

0 to 2.5

±2.5

20

1

0 to 2.5

±2.5

20

1

V

V

pF typ

nA typ

For Full-Scale Input Step

System calibration applies to

unipolar and bipolar ranges.

After calibration, if AIN > VREF,

the device will output all 1s.

If AIN < 0 (unipolar) or –VREF

(bipolar), the device will

output all 0s.

LOGIC INPUTS

All Inputs Except CLKIN

VINL, Input Low Voltage

VINH, Input High Voltage

CLKIN

VINL, Input Low Voltage

VINH, Input High Voltage

IIN, Input Current

LOGIC OUTPUTS

VOL, Output Low Voltage

VOH, Output High Voltage

Floating State Leakage Current

Floating State Output Capacitance

0.8

2.0

0.8

3.5

10

0.4

DVDD – 1

±10

9

0.8

2.0

0.8

3.5

10

0.4

DVDD – 1

±10

9

0.8

2.0

0.8

3.5

10

0.4

DVDD – 1

±10

9

V max

V min

V max

V min

µA max

V max

V min

µA max

pF typ

ISINK = 1.6 mA

ISOURCE = 100 µA

POWER REQUIREMENTS

Power Supply Voltages

Analog Positive Supply (AVDD)

Digital Positive Supply (DVDD)

Analog Negative Supply (AVSS)

Digital Negative Supply (DVSS)

Calibration Memory Retention

Power Supply Voltage

4.5/5.5

4.5/AVDD

–4.5/–5.5

–4.5/–5.5

2.0

4.5/5.5

4.5/AVDD

–4.5/–5.5

–4.5/–5.5

2.0

4.5/5.5

4.5/AVDD

–4.5/–5.5

–4.5/–5.5

2.0

V min/V max

V min/V max

V min/V max

V min/V max

For Specified Performance

V min

–2–

REV. E

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