TCM37C14A, TCM37C15A

PCM COMBO WITH PROGRAMMABLE GAIN CONTROL

SLWS018B – JUNE 1996 – REVISED MAY 1998

6

POST OFFICE BOX 655303

electrical characteristics over recommended ranges of supply voltage and operating free-air

temperature (outputs not loaded) (unless otherwise noted) (continued)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Encoder milliwatt response (transmit gain tolerance)

Signal input = 1.064 Vrms for

µ-law,

Signal input = 1.068 Vrms for A-law

±0.04

±0.2

dBm0

Encoder milliwatt response variation with temperature and

supplies

TA = – 40°C – 85°C, supplies = ± 5%

±0.08

dB

Digital milliwatt response (receive gain tolerance) relative to zero-

transmission level point

Signal input per CCITT G.711,

output signal = 1 kHz

±0.04

±0.2

dBm0

Digital milliwatt response variation with temperature and supplies

TA = – 40°C – 85°C, supplies = ± 5%

±0.08

dB

µ-law

RL = 600 Ω

2.76

Zero transmission level point transmit channel (0 dBm0)

A-law

RL = 600 Ω

2.79

dBm

Zero-transmission-level point, transmit channel (0 dBm0)

µ-law

RL = 900 Ω

1

dBm

A-law

RL = 900 Ω

1.03

µ-law

RL = 600 Ω

5.76

Zero transmission level point receive channel (0 dBm0)

A-law

RL = 600 Ω

5.79

dBm

Zero-transmission-level point, receive channel (0 dBm0)

µ-law

RL = 900 Ω

4

dBm

A-law

RL = 900 Ω

4.03

NOTES:

4. Unless otherwise noted, the analog input is a 0-dBm0, 1020-Hz sine wave, where 0 dBm0 is defined as the zero-reference point

of the channel under test with unity gain set on the amplifier. This corresponds to an analog signal input of 1.064 Vrms, or an output

of 1.503 Vrms.

5. The input amplifier is set for unity gain, noninverting. The digital input is a PCM bit stream generated by passing a 0-dBm0, 1020-Hz

sine wave through an ideal encoder.

6. Receive output is measured single ended with the output amplifier in the unity-gain configuration. All output levels are (sin x)/x

corrected.

gain tracking, reference level = – 10 dBm0

PARAMETER

TEST CONDITIONS

MIN

MAX

UNIT

3 > input level

≥ –40 dBm0

±0.25

Transmit gain tracking error, sinusoidal input

– 40 > input level

≥ –50dBm0

±0.5

dB

– 50 > input level

≥ –55 dBm0

±1.2

3 > input level

≥ –40 dBm0

±0.25

Receive gain tracking error, sinusoidal input

– 40 > input level

≥ –50 dBm0

±0.5

dB

– 50 > input level

≥ –55 dBm0

±1.2

noise

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

Transmit noise, C-message weighted

ANLGIN = AGND

1

7

dBrnC0

Transmit noise, psophometrically weighted

ANLGIN = AGND

–82

–80

dBm0p

Receive noise, C-message-weighted quiet code at PWRO +

PCMIN = 11111111 (

µ-law),

PCMIN = 11010101 (A-law)

2

5

dBrnC0

Receive noise, psophometrically weighted

PCM = lowest positive decode level

–81

dBm0p

† All typical values are at VBB = –5 V, VCC = 5 V, and TA = 25°C.