
3.2
Recommended Operating Conditions
3.3
Electrical Characteristics
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
over operating free-air temperature range (unless otherwise noted)
MIN
NOM
MAX
UNIT
AVDD(1)
Referenced to AVSS(2)
2.7
3.3
3.6
DVDD
Referenced to DVSS(2)
1.65
1.8
1.95
HVDD
Referenced to HVSS(2)
2.7
3.3
3.6
SLVDD(1)
Power-supply voltage range
Referenced to SLVSS(2)
2.7
5.5
V
SRVDD(1)
Referenced to SRVSS(2)
2.7
5.5
TSVDD
Referenced to TSVSS(2)
2.7
3.3
3.6
IOVDD
Referenced to IOVSS(2)
1.1
3.3
3.6
VREF
External voltage reference
Referenced to AVSS(2)
0
3.3
AVDD
V
Resistance applied across class-D output pins
Speaker impedance
8
(BTL)
Headphone impedance
AC coupled to RL
16
Analog audio full-scale input
VI
AVDD = 3.3V, single-ended
0.707
VRMS
voltage
Stereo line output load
AC coupled to RL
10
k
impedance
MCLK(3)
Master clock frequency
IOVDD = 3.3V
50
MHz
SCLK frequency
IOVDD = 3.3V
30
MHz
SCLK
SCLK duty cycle
40%
50%
60%
SCL
SCL clock frequency
400
kHz
TA
Operating free-air temperature
–40
85
°C
(1)
To minimize battery-current leakage, the SLVDD and SRVDD voltage levels should not be below the AVDD voltage level.
(2)
All grounds on board are tied together, so they should not differ in voltage by more than 0.2 V maximum for any combination of ground
signals. By use of a wide trace or ground plane, ensure a low-impedance connection between HVSS and DVSS.
(3)
The maximum input frequency should be 50 MHz for any digital pin used as a general-purpose clock.
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
SAR CONVERTER
Auxilary Analog Input
Input voltage range
0
VREF
V
Input impedance(1)
1/(f
×C)
k
AUX1, AUX2, VBAT input selected as input by touch
screen
Input capacitance
25
pF
Input leakage current
1
A
Input voltage range for VBAT
Battery-measurement mode
0
6
V
(1)
SAR input impedance is dependent on the sampling frequency, where the sampling capacitor is C = 25 pF.
ELECTRICAL SPECIFICATIONS
7