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(3)
DAC to headphone-out PSRR measurement is calculated as
Supp
10
DACOUT
VSIG
PSRR
20 log
V
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TSC2117
Low-Power Audio Codec With Embedded miniDSP, Stereo Class-D
Speaker Amplifier, and Smart Four-Wire Touch-Screen Controller
www.ti.com
SLAS550A – APRIL 2009 – REVISED JUNE 2009
Electrical Characteristics (continued)
At 25
°C, AVDD, HVDD, IOVDD, TSVDD, = 3.3 V, SLVDD, SRVDD = 3.6V, DVDD = 1.8 V, VREF = 3.3 V, f
S (audio) =
48 kHz, CODEC_CLKIN = 256
× f
S, PLL = Off, SAR input is AUX1, VOL/MICDET pin disabled (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Microphone Bias
Page 1/register 46, bits D1–D0 = 10
2.25
2.5
2.75
Voltage output
V
Page 1/register 46, bits D1–D0 = 01
2
At 4-mA load current, page 1/register 46, bits D1–D0
5
= 10 (MICBIAS = 2.5 V)
Voltage regulation
mV
At 4-mA load current, page 1/register 46, bits D1–D0
7
= 01 (MICBIAS = 2 V)
Audio ADC Digital Decimation Filter Characteristics
DAC HEADPHONE OUTPUT, AC-coupled load = 16
(single-ended),
driver gain = 0 dB, parasitic capacitance = 30 pF
Full-scale output voltage (0
Output common-mode setting = 1.65 V
0.707
Vrms
dB)
SNR
Signal-to-noise ratio
Measured as idle-channel noise, A-weighted(1)(2)
80
95
dB
THD
Total harmonic distortion
0-dBFS input
–85
–65
dB
Total harmonic distortion +
THD+N
0-dBFS input
–82
–60
dB
noise
Mute attenuation
87
dB
PSRR
Power-supply rejection ratio(3)
Ripple on HVDD (3.3 V) = 200 mVp-p at 1 kHz
62
dB
RL = 32 , THD+N ≤ –60 dB
20
PO
Maximum output power
mW
RL = 16 , THD+N ≤ –60 dB
60
DAC LINEOUT (HP Driver in Lineout Mode)
SNR
Signal-to-noise ratio
Measured as idle-channel noise, A-weighted
95
dB
THD
Total harmonic distortion
0-dBFS input, 0-dB gain
–86
dB
Total harmonic distortion +
THD+N
0-dBFS input, 0-dB gain
–82
dB
noise
DAC Digital Interpolation Filter Characteristics
DAC OUTPUT to CLASS-D SPEAKER OUTPUT; Load = 8
(differential), 50 pF
SLVDD = SRVDD = 3.6 V, BTL measurement, DAC
input = 0 dBFS, DAC VCM (page 1/register 31, bits
2.2
D4–D3) = 1.65 V, class-D gain = 6 dB,
THD
≤ –16.5 dB
Output voltage
Vrms
SLVDD = SRVDD = 3.6 V, BTL measurement, DAC
input = –2 dBFS, DAC VCM (page 1/register 31, bits
2.1
D4–D3) = 1.65 V, class-D gain = 6 dB, THD
≤ –20 dB
SLVDD = SRVDD = 3.6 V, BTL measurement, DAC
Output, common-mode
input = mute, DAC VCM (page 1/register 31, bits
1.65
V
D4–D3) = 1.65 V, class-D gain = 6 dB
SLVDD = SRVDD = 3.6 V, BTL measurement,
class-D gain = 6 dB, measured as idle-channel noise,
SNR
Signal-to-noise ratio
87
dB
A-weighted (with respect to full-scale output value of
2.2 Vrms)(1)(2)
(1)
Ratio of output level with 1-kHz full-scale sine-wave input, to the output level with the inputs short-circuited, measured A-weighted over a
20-Hz to 20-kHz bandwidth using an audio analyzer.
(2)
All performance measurements done with 20-kHz 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.
ELECTRICAL SPECIFICATIONS
9