CS35L32 Datasheet, PDF (10/51 Pages) Cirrus Logic – Boosted Class D Amplifier with Speaker-Protection Monitoring and Flash LED Drivers

CS35L32
3 Characteristics and Specifications
Table 3-6. Speaker Amplifier Output Characteristics
Test conditions, except where noted otherwise: VA = 1.8 V, VP = 3.6 V, VBST = 5.0 V, 1-kHz input, amp gain = 12 dB, GNDA = GNDP = 0 V, T_A = +25°C,
measurement bandwidth is 20 Hz to 20 kHz, Fs = 48 kHz, MCLK_INT = 6 MHz. MCLK_INT is explained in Section 4.13.1 and Section 7.7.
Parameters
Symbol
Test Conditions
Min Typical Max Units
Continuous average power delivered to load ¹ Po
8- load, THD 10% — 1.75 — W
8- load, THD 1% — 1.45 — W
THD+N
THD+N
8- load, 1.0 W — 0.02 — %
Input voltage @ 1% THD+N
Signal to noise ratio
V_ICLIP
8- load — 0.84 — Vrms
SNR Referenced to output voltage @1% THD+N, A-weighted — 102 — dB
Idle channel noise
ICN
VBST = VP, A-weighted — 25 — Vrms
Common-mode rejection ratio
Frequency response
CMRR
FR
V_ripple = 1 V_PP, f_ripple = 217 Hz —
55
20 Hz to 20 kHz, No input DC blocking caps –0.1 0
— dB
0.1 dB
Efficiency ²
_A
Class D amplifier gain
—
8- load 33 H, 1.7 W — 91 — %
AMP_GAIN = 000 (mute) — –80 — dB
AMP_GAIN = 001 —
9
— dB
AMP_GAIN = 010 — 12 — dB
AMP_GAIN = 011 — 15 — dB
AMP_GAIN = 100 — 18 — dB
N-FET ON resistance
P-FET ON resistance
Output DC offset voltage
Time from shutdown to audio out
R_{DS ON,N}
R_{DS ON,P}
V_OFFSET
t_SD
I_FET = 0.5 A — 185 — m
I_FET = 0.5 A — 205 — m
Inputs AC coupled to ground — ±5 — mV
RESET ^{deasserted, zero-crossing disabled — 15 — ms}
1.Power delivered to the speaker from the 0.1- load side terminal (refer to Fig. 2-1).
2.Efficiency collected using a 5-V external supply, as shown
5V
in the drawing. For this test, the VBST pin should not be
connected to the SPKRSUPPLY pin.
SPKRSUPPLY
3.6 V
ISENSE–/
VSENSE+
1.8 V
SPKOUT+
VP
ISENSE+
VA
SPKOUT–
RSENSE
0.1 
Generic Simulated
Speaker Load
33 H
8
VSENSE–
Audio Precision
AUX-0025 Filter
Audio Precision AP 2700
Audio Analyzer
10
DS963F5