CS8421 查看數據表（PDF） - Cirrus Logic

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CS8421

32-bit, 192-kHz Asynchronous Sample Rate Converter

Cirrus Logic 

DIGITAL FILTER CHARACTERISTICS

CS8421

Parameter

Passband (Upsampling or Downsampling)

Passband Ripple

Stopband

Stopband Attenuation

Group Delay

Min

-

-

0.5465*Fso

125

SRC Mode

-

Bypass Mode

-

Typ

-

-

-

-

(Note 3)

-

Max Units

0.4535*Fso Hz

±0.007

dB

-

Hz

-

dB

-

s

3/Fsi

s

3. The equation for the group delay through the sample-rate converter is (56.581 / Fsi) + (55.658 / Fso).

For example, if the input sample rate is 192 kHz and the output sample rate is 96 kHz, the group delay

through the sample-rate converter is (56.581/192,000) + (55.658/96,000) =.875 milliseconds.

DC ELECTRICAL CHARACTERISTICS

(GND = 0 V; all voltages with respect to 0 V.)

Parameters

Symbol Min Typ Max Units

Power-Down Mode (Note 4)

Supply Current in power-down

(Oscillator attached to XTI-XTO)

VD

VL = 3.3 V

VL = 5.0 V

50

μA

100

μA

200

μA

Supply Current in power-down

(Crystal attached to XTI-XTO)

VD

VL = 3.3 V

VL = 5.0 V

100

μA

1.5

mA

4

mA

Normal Operation (Note 5)

Supply Current at 48 kHz Fsi and Fso

(Oscillator attached to XTI-XTO)

VD

VL = 3.3 V

VL = 5.0 V

24

mA

2.5

mA

4

mA

Supply Current at 192 kHz Fsi and Fso

(Oscillator attached to XTI-XTO)

VD

VL = 3.3 V

VL = 5.0 V

80

mA

8

mA

13

mA

Supply Current at 48 kHz Fsi and Fso

(Crystal attached to XTI-XTO)

VD

VL = 3.3 V

VL = 5.0 V

24

mA

3

mA

7

mA

Supply Current at 192 kHz Fsi and Fso

(Crystal attached to XTI-XTO)

VD

VL = 3.3 V

VL = 5.0 V

80

mA

4

mA

6.5

mA

4. Power Down Mode is defined as RST = LOW with all clocks and data lines held static, except when a

crystal is attached across XTI-XTO, in which case the crystal will begin oscillating.

5. Normal operation is defined as RST = HI.

12

DS641F4

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