MSP58C20

AUDIO-BAND CONVERTER

SPSS015B – DECEMBER 1993 – REVISED JULY 1996

7

POST OFFICE BOX 655303

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

temperature, ADCLK input frequency = 1.024 MHz, PWDA = L and PWAD = L (power-up mode)

(unless otherwise noted) (continued)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Receive gain tolerance

VDD = 5 V,

TA = 25°C,

Input = 1-kHz sine wave at – 28 dBrl

±0.5

dB

Input = 1-kHz sine wave,

Gi

f

l

l

i

Input level = – 1 dBrl to – 43 dBrl

±0.25

Receive gain versus input level

Gain reference level = gain

measured at input level of –28 dBrl,

Input level = – 43 dBrl to – 53 dBrl

±0.5

dB

measured at in ut level of –28 dBrl,

See Note 8

Input level = – 53 dBrl to – 58 dBrl

±1

Receive gain versus

supply voltage

VDD = 4.75 V to 5.25 V,

Digital input = 1-kHz sine wave at – 28 dBrl

±0.15

dB

Receive idle channel in-band

noise

Receive channel idle,

Psophometrically-weighted output noise

–75

dBrlp

TA =25°C

f = 100 Hz

–82

Receive idle channel

single frequency noise

TA = 25°C,

Receive channel idle,

f = 3 kHz

–82

dBrl

single-frequency noise

spectrum (see Note 4)

,

Measurement bandwidth = 125 Hz,

SFi

6

f = 10 kHz

–64

dBrl

s ectrum (see Note 4)

See Figure 6

f = 100 kHz

–64

Receive single-frequency

distortion

Input = one frequency in 0.7-kHz to 1.1-kHz band at – 6 dBrl,

Measured first two harmonics

–50

dB

Receive intermodulation

distortion (see Note 4)

Input = two frequencies in 0.3-kHz to 3.4-kHz band,

Input levels = – 7 dBrl and – 24 dBrl,

Measured second and third intermodulation products

–40

dBrl

Receive signal-to-total-noise-

VDD = 5.25 V, TA = 25°C,

Input=1-kHz sine wave

Input level = –70 dBrl

0

Receive signal-to-total-noise-

plus-distortion ratio

(see Note 9)

In ut = 1-kHz sine wave,

Measured psophometrically-

weighted total noise plus

Input level = –20 dBrl

50

dB

(see Note 9)

weighted total noise plus

distortion,

See Figure 7

Input level = –1 dBrl

50

f = 156 Hz to 4 kHz

– 0.6‡

0.6

f = 4.6875 kHz

– 0.7

– 0.4

f = 6.25 kHz

– 1.75

– 1.4

Receive gain variations versus

input sine wave frequency

VDD = 4.75 V, TA = 25°C,

Input level = –13 dBrl

f = 7.8125 kHz

– 3.35

– 2.9

dB

in ut sine wave frequency

(see Note 6)

In ut level = –13 dBrl,

See Figure 9

f = 9.375 kHz

– 5.25

– 4.8

dB

(see Note 6)

See Figure 9

f = 10.9375 kHz

– 7.25

– 6.8

f = 12.5 kHz

– 9.2

– 8.7

f = 15.625 kHz

– 12.8

– 12.2

Receive power supply rejection

See Note 10

30

dB

† This table contains specifications in which the power levels are expressed in dBrl; dBrl stands for dB above reference level. 0 dBrl is the DAC

overload point. Overload levels of the digital modulator (see parameter measurement information) are 32767 and – 32767 peak values. The 0-dBrl

level is related to maximum differential output voltage, which is typically 2.25 V.

‡ The algebraic convention, in which the less positive (more negative) limit is designated as minimum, is used in this data sheet for receive gain

variations versus input sine-wave frequency.

NOTES:

4. This parameter is characterized but not tested.

6. Gain is relative to gain at 1 kHz.

8. Input satisfies CCITT G.714 15.4 Method 2.

9. Input satisfies CCITT G.714 14.4 Method 2.

10. The power supply rejection measurement is made with a 50-mVrms, 0-kHz to 20-kHz signal applied to VDD and with the receive

channel idle.