AD7762_15 datasheet(4/29 Pages) AD

Il numero della parte	AD7762

Spiegazioni elettronici	625 kSPS, 24-Bit, 109 dB Sigma-Delta ADC With On-Chip Buffer

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Produttore elettronici	AD [Analog Devices]

Homepage	http://www.analog.com

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4 / 29 page

Data Sheet

AD7762

Rev. A | Page 3 of 28

SPECIFICATIONS

AVDD1 = DVDD = VDRIVE = 2.5 V, AVDD2 = AVDD3 = AVDD4 = 5 V, VREF = 4.096 V, MCLK amplitude = 5 V, TA = 25°C, normal mode,

using on-chip amplifier with components as shown in Table 8, unless otherwise noted.1

Table 2.

Parameter

Test Conditions/Comments

Specification

Unit

DYNAMIC PERFORMANCE

Decimate by 256

MCLK = 40 MHz, ODR = 78 kHz, FIN = 1 kHz

Dynamic Range

Modulator inputs shorted

119

120.5

dB min

dB typ

Signal-to-Noise Ratio (SNR)2

Input amplitude = −0.5 dBFS

112

dB typ

Input amplitude = −60 dBFS

59

dB typ

Spurious-Free Dynamic Range (SFDR)

Nonharmonic, input amplitude = −6 dBFS

126

dBc typ

Input amplitude = −60 dBFS

77

dBc typ

Total Harmonic Distortion (THD)

Input amplitude = −0.5 dBFS

−105

dB typ

Input amplitude = −6 dBFS

−106

dB typ

Input amplitude = −60 dBFS

−75

dB typ

Decimate by 64

MCLK = 40 MHz, ODR = 312.5 kHz, FIN = 1 kHz

Dynamic Range

Modulator inputs shorted

112

114

dB min

dB typ

Signal-to-Noise Ratio (SNR)2

Input amplitude = −0.5 dBFS

109.5

dB typ

Spurious-Free Dynamic Range (SFDR)

Nonharmonic, input amplitude = −6 dBFS

126

dBc typ

Decimate by 32

MCLK = 40 MHz, ODR = 625 kHz, FIN =100 kHz

Dynamic Range

Modulator inputs shorted

108

109.5

dB min

dB typ

Signal-to-Noise Ratio (SNR)2

Input amplitude = −0.5 dBFS

107

dB typ

Spurious-Free Dynamic Range (SFDR)

Nonharmonic, input amplitude = −6 dBFS

120

dBc typ

Total Harmonic Distortion (THD)

Input amplitude = −0.5 dBFS

−108

dB typ

Input amplitude = −6 dBFS

−106

dB typ

DC ACCURACY

Resolution

24

Bits

Differential Nonlinearity

Guaranteed monotonic to 24 bits

Integral Nonlinearity

0.00076

% typ

Zero Error

0.014

% typ

0.02

% max

Gain Error

0.015

% typ

Zero Error Drift

0.019

%/°C typ

Gain Error Drift

0.0002

%/°C typ

DIGITAL FILTER RESPONSE

Decimate by 32

Group Delay

MCLK = 40 MHz

47

µs typ

Decimate by 64

Group Delay

MCLK = 40 MHz

91.5

µs typ

Decimate by 256

Group Delay

MCLK = 40 MHz

358

µs typ

ANALOG INPUT

Differential Input Voltage

VIN(+) – VIN(−), VREF = 2.5 V

±2

V p-p

VIN(+) – VIN(−), VREF = 4.096 V

±3.25

V p-p

Input Capacitance

At internal buffer inputs

5

pF typ

At modulator inputs

55

pF typ

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