PCM1794A
www.ti.com.cn
ZHCSEE9B –AUGUST 2004–REVISED DECEMBER 2015
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN
NOM
MAX
UNIT
VDD
3
3.3
3.6
VDC
VCC
VCC2L
VCC2R
1
Supply voltage
4.75
—25
5
5.25
85
VDC
°C
TJ
Operation temperature
6.4 Thermal Information
PCM1794A
DB (SSOP)
28 PINS
66.4
THERMAL METRIC(1)
UNIT
RθJA
Junction-to-ambient thermal resistance
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
RθJC(top)
RθJB
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
25.4
27.5
ψJT
Junction-to-top characterization parameter
Junction-to-board characterization parameter
Junction-to-case (bottom) thermal resistance
2.3
ψJB
27.1
RθJC(bot)
—
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report, SPRA953.
6.5 Electrical Characteristics
all specifications at TA = 25°C, VCC1 = VCC2L = VCC2R = 5 V, VDD = 3.3 V, fS = 44.1 kHz, system clock = 256 fS, and 24-bit
data, unless otherwise noted
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
DATA FORMAT
fS
Sampling frequency
10
200
kHz
fS
System clock frequency
128, 192, 256, 384, 512, 768
DIGITAL INPUT/OUTPUT
Logic family
TTL compatible
2
VIH
VIL
IIH
Input logic level high
VDC
VDC
µA
Input logic level low
0.8
10
Input logic current high
Input logic current low
Output logic level high
Output logic level low
VIN = VDD
IIL
VIN = 0 V
–10
µA
VOH
VOL
IOH = –2 mA
IOL = 2 mA
2.4
VDC
VDC
0.4
DYNAMIC PERFORMANCE (2-V RMS OUTPUT)(1)(2)
fS = 44.1 kHz
0.0004%
0.0008%
0.0015%
0.0008%
THD+N at VOUT = 0 dB
fS = 96 kHz
fS = 192 kHz
EIAJ, A-weighted, fS = 44.1 kHz
EIAJ, A-weighted, fS = 96 kHz
EIAJ, A-weighted, fS = 192 kHz
123
127
127
127
Dynamic range
dB
(1) Filter condition:
(a) THD+N: 20-Hz HPF, 20-kHz apogee LPF
(b) Dynamic range: 20-Hz HPF, 20-kHz AES17 LPF, A-weighted
(c) Signal-to-noise ratio: 20-Hz HPF, 20-kHz AES17 LPF, A-weighted
(d) Channel separation: 20-Hz HPF, 20-kHz AES17 LPF
(e) Analog performance specifications are measured using the System Two Cascade audio measurement system by Audio Precision™
in the averaging mode.
(2) Dynamic performance and dc accuracy are specified at the output of the postamplifier as shown in Figure 25.
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