TMS32020 datasheet(34/57 Pages) TI

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3.3.7

Receive Channel Signal-to-Distortion Ratio (see Note 7)

PARAMETER

TEST CONDITIONS

Av = 1‡

Av = 2‡

Av = 4‡

UNIT

PARAMETER

TEST CONDITIONS

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

VI = – 6 dB to – 0.1 dB

VI = – 12 dB to – 6 dB

VI = – 18 dB to – 12 dB

A/D channel signal to

VI = – 24 dB to – 18 dB

A/D channel signal-to-

distortion ratio

VI = – 30 dB to – 24 dB

distortion ratio

VI = – 36 dB to – 30 dB

VI = – 42 dB to – 36 dB

VI = – 48 dB to – 42 dB

VI = – 54 dB to – 48 dB

‡ Av is the programmable gain of the input amplifier.

§ Measurements under these conditions are unreliable due to overrange and signal clipping.

NOTE 7: The test condition is a 1-kHz input signal with a 16-kHz conversion rate. The load impedance for the DAC is

600

Ω. Input and output voltages are referred to Vref.

3.3.8

Transmit Channel Signal-to-Distortion Ratio (see Note 7)

PARAMETER

TEST CONDITIONS

MIN

MAX

UNIT

VI = – 6 dB to – 0.1 dB

VI = – 12 dB to – 6 dB

VI = – 18 dB to – 12 dB

VI = – 24 dB to – 18 dB

D/A channel signal-to-distortion ratio

VI = – 30 dB to – 24 dB

VI = – 36 dB to – 30 dB

VI = – 42 dB to – 36 dB

VI = – 48 dB to – 42 dB

VI = – 54 dB to – 48 dB

NOTE 7: The test condition is a 1-kHz input signal with a 16-kHz conversion rate. The load impedance for the DAC is

600

Ω. Input and output voltages are referred to Vref.

3.3.9

Receive and Transmit Gain and Dynamic Range (see Note 8)

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

Transmit gain tracking error

C, I

VO = – 48 dB to 0 dB signal range

±0.05 ±0.15

Receive gain tracking error

C, I

VI = – 48 dB to 0 dB signal range

±0.05 ±0.15

Transmit gain tracking error

VO = – 48 dB to 0 dB signal range,

TA = 25°C

±0.05 ±0.25

Receive gain tracking error

VI = – 48 dB to 0 dB signal range,

TA = 25°C

±0.05 ±0.25

Transmit gain tracking error

VO = – 48 dB to 0 dB signal range,

±0.4

Receive gain tracking error

TA = – 55°C TO 125°C

±0.4

NOTE 8: Gain tracking is relative to the absolute gain at 1 kHz and 0 dB (0 dB relative to Vref).

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