TLV320AIC21 datasheet(7/56 Pages) TI1

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ADC DYNAMIC PERFORMANCE

ADC CHANNEL CHARACTERISTICS

DAC PATH FILTER

TLV320AIC20, TLV320AIC21

TLV320AIC24, TLV320AIC25

TLV320AIC20K, TLV320AIC24K

SLAS363D – MARCH 2002 – REVISED APRIL 2005

With IIR Filter, FS = 8 KHz

TEST

PARAMETER

MIN

TYP

MAX

MIN

TYP

MAX

UNIT

CONDITIONS

AIC20/21/24/25

AIC20k/24k

VI = -3 dB

SNR

Signal-to-noise ratio

VI = -9 dB

VI = -3 dB

THD

Total harmonic distortion

VI = -9 dB

VI = -3 dB

Signal-to-harmonic

THD+N

distortion + noise

VI = -9 dB

AIC20/21/24/25/20k/24k

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VI(pp)

Differential-ended input level

PGA gain = 0 dB

VIO

Input offset voltage

±5

Input bias current

125

µA

Common mode voltage

1.35

Dynamic range

VI = -3 dB

Zero Digital

Mute attenuation

PGA = MUTE

Code

Intrachannel isolation

Gain error

VI = -3 dB at 1020 Hz

-0.45

EO(ADC)

ADC converter offset error

±15

Common-mode rejection ratio at INMx and

CMRR

VI = -100 mV at 1020 Hz

INPx

Idle channel noise

V(INP,INM,MICIN) = 0 V

µVrms

Input resistance

TA = 25°C

Ω

Input capacitance

TA = 25°C

IIR

5/fs

Channel delay

FIR

17/fs

FS = 8 KHz (1)(2)

FIR FILTER

IIR FILTER

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

UNIT

PATH FILTER, FS = 8 KHz

0 Hz to 200 Hz

0.1

0.05

200 Hz to 300 Hz

-0.05

0.05

300 Hz to 2.4 KHz

-0.25

0.15

-0.1

0.1

2.4 kHz to 3 kHz

-0.3

0.1

-0.2

0.1

Filter gain relative to gain

at 1020 Hz

3 kHz to 3.4 KHz

-0.55

0.05

-0.25

0.05

3.4 kHz to 3.6 KHz

-30

4 KHz

-28

-34

4.5 KHz to 72 KHZ

-70

(1)

The filter gain outside of the passband is measured with respect to the gain at 1020 Hz. The input signal is the digital equivalent of a

sine wave (digital full scale = 0 dB). The nominal differential DAC channel output with this input condition is 4 VI(PP) . The pass band is

0 to 3600 Hz for an 8-kHz sample rate. This pass band scales linearly with the conversion rate.

(2)

The filter characteristics are specified by design and are not tested in production.

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