CS4218 datasheet(34/44 Pages) CIRRUS

34 / 44 page

Miscellaneous

RESET - Reset Input, PIN 2.(L), 40(Q).

Resets the CS4218 to a known state, and must be initiated after power-up or power-down

mode. Releasing RESET causes the CS4218 to initiate a calibration sequence. The CS4218

automatically initiates a calibration sequence after a sample rate change in master and slave

modes.

CLKIN - Master Clock, PIN 3(L), 41(Q).

CLKIN is the master clock that operates the internal logic. CLKIN is 256

×Fsmax, where Fsmax

is the highest sample frequency needed, for SM3 Master and Slave, and for SM4 Master and

Slave. CLKIN is 16xFsmax in SM3 Multiplier sub-modes. Different sample frequencies are

obtained by either changing the ratio of SCLK to CLKIN in slave modes, or changing the

format pin values (F2-F0) in master modes.

PDN - Power Down, PIN 13(L), 7(Q).

This pin, when low, causes the CS4218 to go into a power down state. RESET should be held

low for 50 ms when exiting the power down state to allow time for the voltage reference to

settle.

DI1 - Parallel Digital Bit Input #1, PIN 33(L), 27(Q).

This pin value is reflected in the DI1 bit in the sub-frame.

DO1 - Parallel Digital Bit Output #1, PIN 37(L), 31(Q).

This pin reflects the value of the DO1 bit in the sub-frame

FILT - PLL Filter, PIN 6(L), 44(Q).

This pin should have the 0.47

µF PLL loop filter capicator connected when using SM3

Multiplier sub-modes. When using SM3-M, SM3-S, SM4, or SM5 modes, this pin should be

left floating. This pin has an internal pull-down making the CS4218 pin compatible with the

CS4216 operating in serial modes SM3-M, SM3-S, and SM4.

NC - No Connection,

PINS 7, 8, 9, 10, 11, 12, 14, 17, 18, 19(L)

PINS 1, 2, 3, 4, 5, 6, 8, 11, 12, 13(Q).

These pins should be left floating with no trace attached to allow backwards compatibility with

future revisions. They should not be used as a convenient path for signal traces.

CS4218

DS135F1

CS4218 датащи(PDF) 34 Page - Cirrus Logic