CS4461 Datasheet, PDF (6/11 Pages) Cirrus Logic – Multi-Bit A/D for Class-D Real-Time PSR Feedback

2. PIN DESCRIPTIONS
CS4461
PSR_RESET
GND
PSR_SYNC
PSR_DATA
PSR_MCLK
VDP
GND
VDP
TEST
GND
PSR_EN
GND
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
Top-Down View
15
11
24-pin TSSOP Package ₁₄
12
13
FILT+
REFGND
VQ
GND
GND
VA
GND
AIN-
AIN+
OVERFLOW
VDP
VDP
Pin Name #
Pin Descriprion
VDP
VA
6
8 Digital Logic Power (Input) – Digital core and input/output power supply. Nominally +3.3 V or +5.0 V.
13 Supply decoupling should placed as close as possible to pin 6.
14
19 Analog Power (Input) - Analog power supply. Nominally +5.0 V.
GND
2
7
10
12 Ground (Input) - Ground reference for both analog and digital.
18
20
21
Reset (Input) - When PSR_RESET is low, the CS4461 enters a low power mode and all internal states
PSR_RESET 1 are reset. On initial power up, PSR_RESET must be held low until the power supply is stable, and all
input clocks are stable in frequency and phase.
VQ
22 Quiescent Voltage (Output) - Filter connection for the internal quiescent reference voltage.
REFGND
23 Reference Ground (Input) - Ground reference for the internal sampling circuits.
FILT+
24 Positive Voltage Reference (Output) - Positive reference voltage for the internal sampling circuit.
AIN+
AIN-
16 Differential PSR Analog Input (Input) - Signals are presented differentially to the delta-sigma modula-
17 tor via the AIN+/- pins.
PSR_MCLK
5 Master Clock (Input) - Clock source for the delta-sigma modulator and output data.
PSR_SYNC
3 Synchronization Data Output (Output) - Used to synchronize the serial data in the PWM modulator.
PSR_DATA
4 PSR Serial Data Output (Output) - Power supply modulated and formatted serial data.
PSR_EN
11 PSR Enable (Input) - A high to low transition on this pin will enable the PSR feedback circuit.
OVERFLOW
TEST
15 Overflow (Output, open drain) - Indicates a modulator overflow condition.
9
Test (Output) - This pin may toggle during normal operation and should be pulled low through a 47 kΩ
resistor to GND in order to minimize noise.
6
DS650F1