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TCM37C14A Datasheet(PDF) 6 Page - Texas Instruments

Part No. TCM37C14A
Description  PCM COMBO WITH PROGRAMMABLE GAIN CONTROL
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TCM37C14A Datasheet(HTML) 6 Page - Texas Instruments

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TCM37C14A, TCM37C15A
PCM COMBO WITH PROGRAMMABLE GAIN CONTROL
SLWS018B – JUNE 1996 – REVISED MAY 1998
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (outputs not loaded) (unless otherwise noted) (continued)
gain and dynamic range, VCC = 5 V, VBB = –5 V, TA = 25°C (see Notes 4, 5, and 6) (unless otherwise noted)
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.


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