TLC320AC02IPM datasheet(44/84 Pages) TI

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3–5

3.5.7

Noise, Low-Pass and Band-Pass Switched-Capacitor Filters Included,

VDD = 5 V (Unless Otherwise Noted)

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

ADC idle channel noise

Inputs tied to ADC VMID,

8 kHz

FCLK

144 kHz

180

300

ADC idle-channel noise

fs = 8 kHz, FCLK = 144 kHz,

(see Note 11)

180

300

DAC idle channel

Broad-band noise

DIN INPUT = 00000000000000,

180

300

µVrms

DAC idle-channel

noise

Noise (0 to 7.2 kHz)

DIN INPUT

00000000000000,

fs = 8 kHz, FCLK = 144 kHz,

)

180

300

noise

Noise (0 to 3.6 kHz)

(see Note 12)

180

300

† All typical values are at VDD = 5 V and TA = 25°C.

NOTES: 11. The ADC channel noise is calculated by taking the RMS value of the digital output codes of the ADC

channel and converting to microvolts.

12. The DAC channel noise is measured differentially from OUT + to OUT – across 600

Ω.

3.5.8

Absolute Gain Error, VDD = 5 V, fs = 8 kHz (Unless Otherwise Noted)

PARAMETER

TEST CONDITIONS

MIN

MAX

UNIT

ADC channel absolute gain error (see Note 13)

– 1-dB input signal

TA = –40 – 85°C

±1

DAC channel absolute gain error (see Note 14)

0-dB input signal,

RL = 600 Ω

TA = –40 – 85°C

±1

NOTES: 13. ADC absolute gain error is the variation in gain from the ideal gain over the specified input signal levels.

The gain is measured with a – 1-dB, 1020-Hz sine wave. The – 1-dB input signal allows for any positive gain

or offset error that may affect gain measurements at or close to 0-dB input signal levels.

14. The DAC input signal is the digital equivalent of a 1020-Hz sine wave (full-scale analog output at digital full-

scale input = 0 dB). The nominal differential DAC channel output voltage with this input condition is 6 V peak

to peak. The load impedance for the DAC output buffer is 600

Ω from OUT+ to OUT–.

3.5.9

Relative Gain and Dynamic Range, VDD = 5 V, fs = 8 kHz (Unless Otherwise

Noted)

PARAMETER

TEST CONDITIONS

MIN

MAX

UNIT

ADC channel relative gain tracking error

(see Note 15)

– 48-dB to – 1-dB input signal range

±0.2

DAC channel relative gain tracking error

(see Note 16)

– 48-dB to 0-dB input signal range

RL(diff) = 600 Ω

±0.2

NOTES: 15. ADC gain tracking is the ratio of the measured gain at one ADC channel input level to the gain measured

at any other input level. The ADC channel input is a –1-dB 1020-Hz sine wave input signal. A –1-dB input

signal allows for any positive gain or offset error that may affect gain measurements at or close to 0-dB ADC

input signal levels.

16. DAC gain tracking is the ratio of the measured gain at one DAC channel digital input level to the gain

measured at any other input level. The DAC-channel input signal is the digital equivalent of a 1020-Hz sine

wave (digital full scale = 0 dB). The nominal differential DAC channel output voltage with this input condition

is 6 V peak to peak. The load impedance for the DAC output buffer is 600

Ω from OUT+ to OUT–.

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