TLC320AC02C_15 Datasheet, PDF (43/86 Pages) Texas Instruments – Single-Supply Analog Interface Circuit

3.5.7
Noise, Low-Pass and Band-Pass Switched-Capacitor Filters Included,
V_DD = 5 V (Unless Otherwise Noted)
PARAMETER
TEST CONDITIONS
MIN TYP† MAX UNIT
ADC idle-channel noise
DAC idle-channel
noise
Broad-band noise
Noise (0 to 7.2 kHz)
Noise (0 to 3.6 kHz)
Inputs tied to ADC VMID,
fs = 8 kHz, FCLK = 144 kHz,
(see Note 11)
DIN INPUT = 00000000000000,
fs = 8 kHz, FCLK = 144 kHz,
(see Note 12)
180
300
180
300 ^µVrms
180
300
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, V_DD = 5 V, f_s = 8 kHz (Unless Otherwise Noted)
PARAMETER
TEST CONDITIONS
MIN MAX UNIT
ADC channel absolute gain error (see Note 13)
DAC channel absolute gain error (see Note 14)
– 1-dB input signal
0-dB input signal,
RL = 600 Ω
TA = –40 – 85°C
TA = –40 – 85°C
±1
dB
±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, V_DD = 5 V, f_s = 8 kHz (Unless Otherwise
Noted)
PARAMETER
TEST CONDITIONS
MIN MAX UNIT
ADC channel relative gain tracking error
(see Note 15)
DAC channel relative gain tracking error
(see Note 16)
– 48-dB to – 1-dB input signal range
– 48-dB to 0-dB input signal range
RL(diff) = 600 Ω
± 0.2
dB
± 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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