Cirrus Logic CS470xx - Manual (Page 24)

DS787PP9 24
5.17 DAC Characteristics
5.17.2 Analog Output Characteristics (Automotive)
Test Conditions (unless otherwise specified): T
A
= –40 to +85 C; VDD = 1.8V±5%, VDDA(VA) = 3.3V±5%; 1 kHz sine
wave driven through a filter shown in Fig. 5-15 or Fig. 5-16 ; DSP running test application; Measurement Bandwidth is
20 Hz–20 kHz.
1. Guaranteed by design. The DC current draw represents the allowed current draw from the AOUT pin due to typical leakage through the electrolytic
DC-blocking capacitors.
2. Guaranteed by design. R
L
and C
L
reflect the recommended minimum resistance and maximum capacitance required for the internal op-amp’s
stability and signal integrity. In this circuit topology, C
L
represents any capacitive loading that appears before the 560  series resistor (typically
parasitic), and effectively moves the dominant pole of the two-pole amp in the output stage. Increasing this value beyond the recommended 100 pF
can cause the internal op-amp to become unstable.
Figure 5-15. DAC Single-ended Output Test Circuit
Analog Input
Full-scale Output 1.20 1.40 • VA 1.60 0.60 0.70 • VA 0.80 V
PP
Interchannel Gain Mismatch — 0.1 — — 0.1 — dB
Gain Drift — ± 120 — — ± 120 — ppm/°C
Output Impedance — 100 — — 100 —

DC Current Draw from an AOUT Pin 1 — — 10 — — 10

A
AC-load Resistance (R
L
) 2 3 — — 3 — — k

Load Capacitance (C
L
) 2 — — 100 — — 100 pF
Differential Single-ended
Parameter Min Typ Max Min Typ Max Unit
Fs = 96 kHz
Dynamic Range
A-weighted
Unweighted
100
97
108
105 —
— 97
94 105
102 —
— dB
dB
Total Harmonic Distortion + Noise
0 dB
–20 dB
–60 dB
—
—
— –98
–88
–48 –90
—
—
—
—
— –95
–85
–45 –87
—
—
dB
dB
dB
Interchannel Isolation (1 kHz) — 95 — — 95 — dB
Analog Input
Full-scale Output 1.20 1.40 • VA 1.60 0.60 0.70 • VA 0.80 V
PP
Interchannel Gain Mismatch — 0.1 — — 0.1 — dB
Gain Drift — ± 120 — — ± 120 — ppm/°C
Output Impedance — 100 — — 100 —

DC Current Draw from an AOUT Pin 1 — — 10 — — 10  A
AC-load Resistance (R
L
) 2 3 — — 3 — — k 
Load Capacitance (C
L
) 2 — — 100 — — 100 pF
Differential Single-ended
Parameter Min Typ Max Min Typ Max Unit
AOUT_x+
3.3 µF
C
L
R
L
AOUT
2200 pF
560
10 k
+