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AD7657
(Rev.:RevPrl)

250 kSPS, 6-Channel,Simultaneous Sampling, Bipolar 12/14/16-Bit ADC

Analog Devices 

Preliminary Technical Data

AD7658/AD7657/AD7656

AD7657 SPECIFICATIONS1

Table 2. AVCC = 4.5 V to 5.5 V, VDD = 9.5 V to 16.5 V, VSS = -9.5 V to -16.5V, DVCC = 4.5 V to 5.5 V, VDRIVE = 2.7V to 5.25V, fSAMPLE =

250 kSPS, VREF = 2.5V Internal/External, unless otherwise noted; TA = TMIN to TMAX, unless otherwise noted

Parameter

B Versions1

Unit

Test Conditions/Comments

DYNAMIC PERFORMANCE

Signal-to-Noise + Distortion (SINAD2

81

dB min

fIN = 50 kHz sine wave

Signal-to-Noise Ratio (SNR)2

82

dB min

83

dB typ

Total Harmonic Distortion (THD)2

−97

dB typ

Peak Harmonic or Spurious Noise (SFDR)2

−95

dB typ

Intermodulation Distortion (IMD)2

Second-Order Terms

−94

dB typ

Third-Order Terms

−100

dB typ

Aperture Delay

20

ns max

Aperature Delay Matching

2

ns max

100

ps typ

Aperture Jitter

30

ps typ

Full Power Bandwidth

8

MHz typ

@ −3 dB

2.2

MHz typ

@ −0.1 dB

DC ACCURACY

No Missing Codes

14

Bits min

Integral Nonlinearity2

±1.5

LSB typ

Positive Full Scale Error2

±0.4

% FS max

Bipolar Zero Error2

Negative Full Scale Error2

±2.1

mV max

VDD = 5.5 V

±0.4

% FS max

ANALOG INPUT

Input Voltage Ranges

±4xVREF

V

RNG bit/RANGE pin = 0

±2xVREF

V

RNG bit/RANGE pin = 1

DC Leakage Current

±0.3

µA max

Input Capacitance

30

pF typ

REFERENCE INPUT/OUTPUT

Reference output voltage

2.49/2.51

V min/max

Reference input Voltage range

2.5/3

V min/max

DC Leakage current

±0.5

µA max

VREF Pin

Input capacitance

20

pF typ

VREF Output Impedance

1

kOhms typ

Reference temperature Coefficient

25

ppm/°C max

10

ppm/°C typ

LOGIC INPUTS

Input High Voltage, VINH

0.7 x VDRIVE

V min

Input Low Voltage, VINL

Input Current, IIN

Input Capacitance, CIN 3

0.3 x VDRIVE

±0.3

10

V max

µA max

pF max

Typically 10 nA, VIN = 0 V or VCC

LOGIC OUTPUTS

Output High Voltage, VOH

VDRIVE – 0.2

V min

ISOURCE = 200 µA;

Output Low Voltage, VOL

0.4

V max

ISINK = 200 µA

Floating-State Leakage Current

±0.3

µA max

Floating-State Output Capacitance 3

10

pF max

Output Coding

Two’s Complement

CONVERSION RATE

Conversion Time

3

µs max

Track-and-Hold Acquisition Time

500

ns max

Throughput Rate

250

kSPS

POWER REQUIREMENTS

Rev. PrI | Page 5 of 25

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