CMX7262 datasheet(45/52 Pages) CMLMICRO

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TWELP Vocoder

CMX7262

 2013 CML Microsystems Plc

Page 45

D/7262_FI-1.x/4

7.1.3

Operating Characteristics

For the following conditions unless otherwise specified:

External components as recommended in Section 5, External Components.

Maximum load on digital outputs = 30pF.

Xtal Frequency = 9.6MHz

0.01% (100ppm); T

AMB = 40C to +85C.

AVDD = DVDD = 3.0V to 3.6V.

Reference Signal Level = 308mV rms at 1kHz with AVDD = 3.3V.

Signal levels track with supply voltage, so scale accordingly.

Signal to Noise Ratio (SNR) in bit rate bandwidth.

Input stage gain = 0dB. Output stage attenuation = 0dB.

Current consumption figures quoted in this section apply to the device only when loaded with

CMX7262 FI-1.0.0.0. Current consumption may vary with Function Image

™.

DC Parameters

Notes

Min.

Typ.

Max.

Unit

XTAL/CLK

Input Logic ‘1’

70%

–

DVDD

Input Logic ‘0’

–

30%

DVDD

Input Current (Vin = DVDD)

–

µA

Input Current (Vin = DVSS)

-40

–

µA

C-BUS Interface and Logic Inputs

Input Logic ‘1’

70%

–

DVDD

put Logic ‘0’

–

30%

DVDD

Input Leakage Current (Logic ‘1’ or ‘0’)

-1.0

–

1.0

µA

Input Capacitance

–

7.5

C-BUS Interface and Logic Outputs

Output Logic ‘1’ (IOH = 2mA)

90%

–

DVDD

Output Logic ‘0’ (IOL = -5mA)

–

10%

DVDD

“Off” State Leakage Current

-1.0

–

1.0

µA

VBIAS

Output Voltage Offset w.r.t. AVDD/2 (IOL < 1A)

–

±2%

–

AVDD

Output Impedance

–



Notes:

Characteristics when driving the XTAL/CLK pin with an external clock source.

Applies when utilising VBIAS to provide a reference voltage to other parts of the

system. When using VBIAS as a reference, VBIAS must be buffered. VBIAS must

always be decoupled with a capacitor as shown in Section 5 External

Components.

TAMB = 25C, not including any current drawn from the device pins by external

circuitry.

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