PCM3070

SLAS724

– FEBRUARY 2011

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Electrical Characteristics, ADC (continued)

At 25

PLL disabled unless otherwise noted.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

AUDIO ADC

Input signal level (0dB)

Differential Input, CM=0.9V

10

mV

1kHz sine wave input

Differential configuration

IN1L and IN1R routed to Right ADC

IN2L and IN2R routed to Left ADC

Device Setup

AGC = OFF, Channel Gain=40dB Processing

Block = PRB_R1,

ICN

Inputs ac-shorted to ground, input referred

2

noise

AUDIO ADC

1kHz sine wave input

–0.05

dB

Single-ended configuration

Gain Error

AGC = OFF, Channel Gain=0dB

Processing Block = PRB_R1,

1kHz sine wave input at -3dBFS

108

dB

Single-ended configuration

IN1L routed to Left ADC

Input Channel Separation

AGC = OFF, AOSR = 128,

Channel Gain=0dB, CM=0.9V

1kHz sine wave input at

–3dBFS on IN2L,

115

dB

IN2L internally not routed.

Input Pin Crosstalk

IN1L routed to Left ADC

ac-coupled to ground

1kHz sine wave input at

–3dBFS on IN2R,

IN2R internally not routed.

IN1R routed to Right ADC

ac-coupled to ground

AOSR=128 Channel, Gain=0dB, CM=0.9V

217Hz, 100mVpp signal on AVdd,

55

dB

PSRR

Single-ended configuration, Rin=20K,

Channel Gain=0dB; CM=0.9V

Single-Ended, Rin = 10K, PGA gain set to

0

dB

0dB

Single-Ended, Rin = 10K, PGA gain set to

47.5

dB

47.5dB

Single-Ended, Rin = 20K, PGA gain set to

–6

dB

0dB

ADC programmable gain amplifier gain

Single-Ended, Rin = 20K, PGA gain set to

41.5

dB

47.5dB

Single-Ended, Rin = 40K, PGA gain set to

–12

dB

0dB

Single-Ended, Rin = 40K, PGA gain set to

35.5

dB

47.5dB

(3)

Ratio of output level with 1kHz full-scale sine wave input, to the output level with the inputs short circuited, measured A-weighted over a

20Hz to 20kHz bandwidth using an audio analyzer.

(4)

All performance measurements done with 20kHz low-pass filter and, where noted, A-weighted filter. Failure to use such a filter may

result in higher THD+N and lower SNR and dynamic range readings than shown in the Electrical Characteristics. The low-pass filter

removes out-of-band noise, which, although not audible, may affect dynamic specification values

8

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