AD1870JR 데이터 시트보기 (PDF) - Analog Devices

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AD1870JR

Single-Supply 16-Bit ∑-∆ Stereo ADC

Analog Devices 

AD1870

PIN FUNCTION DESCRIPTIONS

Input/ Pin

Pin Output Name

Description

1

I/O

LRCK

Left/Right Clock

2

I/O

WCLK Word Clock

3

I/O

BCLK Bit Clock

4

I

5

I

DVDD1 5 V Digital Supply

DGND1 Digital Ground

6

I

7

I

8

I

RDEDGE Read Edge Polarity Select

S/M

Slave/Master Select

384/256 Clock Mode

9

I

10 I

11 O

AVDD

VINL

CAPL1

5 V Analog Supply

Left Channel Input

Left External Filter Capacitor 1

12 O

CAPL2 Left External Filter Capacitor 2

13 I

AGNDL Left Analog Ground

14 O

15 O

16 I

VREFL

VREFR

AGNDR

Left Reference Voltage Output

Right Reference Voltage Output

Right Analog Ground

17 O

18 O

CAPR2

CAPR1

Right External Filter Capacitor 2

Right External Filter Capacitor 1

19 I

20 I

21 I

22 I

23 I

VINR

AGND

RLJUST

MSBDLY

RESET

Right Channel Input

Analog Ground

Right/Left Justify

Delay MSB One BCLK Period

Reset

24 I

DGND2 Digital Ground

25 I

26 O

DVDD2

SOUT

5 V Digital Supply

Serial Data Output

27 O

TAG

Serial Overrange Output

28 I

CLKIN Master Clock

DEFINITIONS

Dynamic Range

The ratio of a full-scale output signal to the integrated output

noise in the passband (20 Hz to 20 kHz), expressed in decibels

(dB). Dynamic range is measured with a –60 dB input signal

and is equal to (S/(THD + N)) 60 dB. Note that spurious har-

monics are below the noise with a –60 dB input, so the noise

level establishes the dynamic range. The dynamic range is speci-

fied with and without an A-Weight filter applied.

Signal to (Total Harmonic Distortion + Noise)

(S/(THD + N))

The ratio of the root-mean-square (rms) value of the fundamen-

tal input signal to the rms sum of all other spectral components

in the passband, expressed in decibels (dB).

Signal to Total Harmonic Distortion (S/THD)

The ratio of the rms value of the fundamental input signal to the

rms sum of all harmonically related spectral components in the

passband, expressed in decibels.

Passband

The region of the frequency spectrum unaffected by the attenu-

ation of the digital decimator’s filter.

Passband Ripple

The peak-to-peak variation in amplitude response from equal-

amplitude input signal frequencies within the passband,

expressed in decibels.

Stop Band

The region of the frequency spectrum attenuated by the digi-

tal decimator’s filter to the degree specified by “stop band

attenuation.”

Gain Error

With a near full-scale input, the ratio of actual output to

expected output, expressed as a percentage.

Interchannel Gain Mismatch

With identical near full-scale inputs, the ratio of outputs of the

two stereo channels, expressed in decibels.

Gain Drift

Change in response to a near full-scale input with a change in

temperature, expressed as parts-per-million (ppm) per °C.

Midscale Offset Error

Output response to a midscale dc input, expressed in least-

significant bits (LSBs).

Midscale Drift

Change in midscale offset error with a change in temperature,

expressed as parts-per-million (ppm) per °C.

Crosstalk (EIAJ Method)

Ratio of response on one channel with a grounded input to a

full-scale 1 kHz sine-wave input on the other channel, expressed

in decibels.

Power Supply Rejection

With no analog input, signal present at the output when a

300 mV p-p signal is applied to power supply pins, expressed in

decibels of full scale.

Group Delay

Intuitively, the time interval required for an input pulse to

appear at the converter’s output, expressed in milliseconds

(ms). More precisely, the derivative of radian phase with respect

to radian frequency at a given frequency.

Group Delay Variation

The difference in group delays at different input frequencies.

Specified as the difference between largest and the smallest

group delays in the passband, expressed in microseconds (µs).

REV. 0

–5–

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