AD7761BSTZ datasheet(6/76 Pages) AD

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Data Sheet

AD7761

Rev. A | Page 5 of 75

SPECIFICATIONS

AVDD1A = AVDD1B = 4.5 V to 5.5 V, AVDD2A = AVDD2B = 2.0 V to 5.5 V, IOVDD = 1.72 V to 1.88 V and 2.25 V to 3.6 V, AVSS =

DGND = 0 V, REFx+ = 4.096 V and REFx− = 0 V, MCLK = 32.768 MHz, analog input precharge buffers on, reference precharge buffers

off, wideband filter, fCHOP = fMOD/32, TA = −40°C to +105°C, unless otherwise noted.

Table 1.

Parameter

Test Conditions/Comments

Min

Typ

Max

Unit

ADC SPEED AND PERFORMANCE

Output Data Rate (ODR), per

Channel1

Fast

256

kSPS

Median

128

kSPS

Low power

kSPS

−3 dB Bandwidth (BW)

Fast, wideband filter

110.8

kHz

Median, wideband filter

55.4

kHz

Low power, wideband filter

13.8

kHz

Data Output Coding

Twos complement, MSB first

No Missing Codes2

Bits

DYNAMIC PERFORMANCE

Decimation by 32, 256 kSPS ODR

Dynamic Range

Shorted input, wideband filter

97.3

97.7

Signal-to-Noise Ratio (SNR)

1 kHz, −0.5 dBFS, sine wave input

Sinc5 filter

97.3

97.9

Wideband filter

97.3

97.7

Signal-to-Noise-and-Distortion

Ratio (SINAD)

1 kHz, −0.5 dBFS, sine wave input

97.3

97.7

Total Harmonic Distortion (THD)

1 kHz, −0.5 dBFS, sine wave input

−120

−107

Spurious-Free Dynamic Range (SFDR)

126

dBc

INTERMODULATON DISTORTION (IMD)

fINA = 9.7 kHz, fINB = 10.3 kHz

Second order

−125

Third order

−124

ACCURACY

INL3

Endpoint method

±1

± 1.5

LSB

Offset Error4

±1

±2

LSB

Gain Error4

TA = 25°C

±5

±40

LSB

Gain Drift vs. Temperature2

±0.01

±0.02

LSB/°C

VCM PIN

Output

With respect to AVSS

(AVDD1 −

AVSS)/2

Load Regulation

∆VOUT/∆IL

400

µV/mA

Voltage Regulation

Applies to the following VCM output

options only: VCM = ∆VOUT/∆(AVDD1 −

AVSS)/2, VCM = 1.65 V, and VCM = 2.5 V

µV/V

Short-Circuit Current

ANALOG INPUTS

See the Analog Inputs section

Differential Input Voltage Range

VREF = (REFx+) − (REFx−)

−VREF

+VREF

Input Common-Mode Range2

AVSS

AVDD1

Absolute Analog Input Voltage Limits2

AVSS

AVDD1

Analog Input Current

Unbuffered

Differential component

±48

µA/V

Common-mode component

±17

µA/V

Precharge Buffer On5

−20

µA

Input Current Drift

Unbuffered

±5

nA/V/°C

Precharge Buffer On

±31

nA/°C

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