AD7938 Просмотр технического описания (PDF) - Analog Devices

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AD7938

8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer

Analog Devices 

AD7938/AD7939

AD7938—SPECIFICATIONS

VDD = VDRIVE = 2.7 V to 5.25 V, internal/external VREF = 2.5 V, unless otherwise noted, FCLKIN = 25.5 MHz, FSAMPLE = 1.5 MSPS; TA = TMIN to

TMAX, unless otherwise noted.

Table 1.

Parameter

DYNAMIC PERFORMANCE

Signal-to-Noise + Distortion (SINAD)2

Signal-to-Noise Ratio (SNR)2

Total Harmonic Distortion (THD)2

Peak Harmonic or Spurious Noise (SFDR)2

Intermodulation Distortion (IMD)2

Second-Order Terms

Third-Order Terms

Channel-to-Channel Isolation

Aperture Delay2

Aperture Jitter2

Full Power Bandwidth2

DC ACCURACY

Resolution

Integral Nonlinearity2

Differential Nonlinearity2

Differential Mode

Single-Ended Mode

Single-Ended and Pseudo-Differential Input

Offset Error2

Offset Error Match2

Gain Error2

Gain Error Match2

Fully Differential Input

Positive Gain Error3

Positive Gain Error Match2

Zero-Code Error2

Zero-Code Error Match2

Negative Gain Error2

Negative Gain Error Match2

ANALOG INPUT

Single-Ended Input Range

Pseudo-Differential Input Range: VIN+

VIN−

Fully Differential Input Range: VIN+ and VIN−

VIN+ and VIN−

DC Leakage Current4

Input Capacitance

B Version1

70

68

71

69

−73

−70

−73

−86

−90

−85

5

72

50

10

12

±1

±1.5

±0.95

−0.95/+1.5

±6

±1

±3

±1

±3

±1

±6

±1

±3

±1

0 to VREF or 0 to 2 × VREF

0 to VREF or 2 × VREF

−0.3 to +0.7

−0.3 to +1.8

VCM ± VREF/2

VCM ± VREF

±1

45

10

Unit

dB min

dB min

dB min

dB min

dB max

dB max

dB max

dB typ

dB typ

dB typ

ns typ

ps typ

MHz typ

MHz typ

Bits

LSB max

LSB max

LSB max

LSB max

LSB max

LSB max

LSB max

LSB max

LSB max

LSB max

LSB max

LSB max

LSB max

LSB max

V

V

V typ

V typ

V

V

µA max

pF typ

pF typ

Test Conditions/Comments

FIN = 50 kHz sine wave

Differential mode

Single-ended mode

Differential mode

Single-ended mode

−85 dB typ, differential mode

−80 dB typ, single-ended mode

−82 dB typ

fa = 30 kHz, fb = 50 kHz

FIN = 50 kHz, FNOISE = 300 kHz

@ 3 dB

@ 0.1 dB

Differential mode

Single-ended mode

Guaranteed no missed codes to 12 bits

Guaranteed no missed codes to 12 bits

Straight binary output coding

Twos complement output coding

RANGE bit = 0, or RANGE bit =1, respectively

RANGE bit = 0, or RANGE bit =1, respectively

VDD = 3 V

VDD = 5 V

VCM = common-mode voltage3 = VREF/2

VCM = VREF, VIN+ or VIN− must remain within GND/VDD

When in track

When in hold

Rev. 0 | Page 3 of 32

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