STLC7550 datasheet(13/17 Pages) STMICROELECTRONICS

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Transmit Characteristics

Performance of the Tx channel

Typical values are given for AVDD = 3V, Tamb = 25°C and for nominal master clock MCLK = 1.536MHz,

differential mode and oversampling ratio = 160. Measurement band = 100Hz to 0.425 x Sampling frequency.

Symbol

Parameter

Min.

Typ.

Max.

Unit

Gabs

Absolute Gain at 1kHz

-0.5

0.5

Ripple

Ripple in Band : 0 to 0.425 x FS

±0.2

THD

Total Harmonic Distortion (differential Tx signal : VOUT = 1.25VPP, f = 1kHz)

-85

-92

Dynamic Range (f = 1kHz) (measured over the full 0 to FS/2 with a -20dBr

output signal and extrapolated to full scale) (see Note 2)

CRxTx

Crosstalk (transmit channel to receive channel)

Smoothing filter transfer characteristics

The cut-off frequency of the single pole switch-capacitor low-pass filter following the DAC is :

fc−3dB =

⋅ 32 ⋅ FS

⋅ π ⋅ 10

with n = 2, 3, 4, 5, 6 (see paragraph Functional Description 1.2).

Receive Characteristics

Performance of the Rx channel

Typical values are given for AVDD =3V, Tamb = 25°C and for nominal master clock MCLK = 1.536MHz,

differential mode and oversampling ratio = 160. Measurement band = 100Hz to 0.425 x Sampling Frequency.

Symbol

Parameter

Min.

Typ.

Max.

Unit

Gabs

Absolute Gain at 1kHz

-0.5

0.5

Ripple

Ripple in Band : 0 to 0.425 x FS

±0.2

THD

Total Harmonic Distortion (differential Rx signal : VIN = 1.25VPP, f = 1kHz)

-92

Dynamic Range (f = 1kHz) (measured over the full 0 to FS/2 with a -20dBr

input and extrapolated to full scale) (see Note 2)

PSRR

Power Supply Rejection Ratio (f = 1kHz, VAC = 200mVPP)50

CTxRx

Crosstalk (transmit channel to receive channel)

Note 2 : The dynamic range can be measured in bit with : Nbit

− 1.76

6.02

with DR in dB.

ELECTRICAL SPECIFICATIONS (continued)

STLC7550

13/17

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