REV. M

Page 26

September 1998

AS3502

£VDD£4.5 V)

Symbol

Parameter

Conditions

Min.

Typ.*

Max.

Units

f

Frequency Range

Step size is 3.9 Hz

3.9

3996

Hz

Æf

Frequency Tolerance

± 1%

THD

Total Harmonic Distortion

300 Hz

£ f £3996 Hz ; 3.14 dBm0

40

dB

tCP

tCO

Cadence Period

Cadence On Time

CS Bit = Low ; Step Size = 1 ms

CS Bit = High; Step Size = 4 ms

2

8

255

1020

ms

ms

tRP

tRO

Repetition Period

Repetition On Time

Step Size = 32 ms

64

8160

ms

ms

tRO

Pulse Width Volume Period

PS Bit = Low; Step Size = 1µs

PS Bit = High; Step Size = 4µs

2

8

255

1020

µs

µs

VoutTX

TX Sine Tone Level

Note 1;

3.14

dBm0

VoutSINE-EP Earpiece Sine Tone Level

Note 4; AGR= +6 dB

-0.2

dBm

VoutSINE-SP Speaker Sine Tone Level

Note 4; AGR= +6 dB

-2.8

dBm

Vout

TX DTMF Row Tone Level

Note 2

-4.7

dBm0

PREEM

DTMF Preemphasis

Column to Row Tone

+2.5

dB

V2

Sine Wave Volume Control

-42.5

-10

dB

dV2C

Volume Coarse Step Size

6

dB

dV2F

Volume Fine Step Size

2.5

dB

VoutSQ

TX Peak Square Tone Level

Note 3

3.14

dBm

VoutSQ-EP

RX Peak Square Tone Level

AGR=+6dB; Note 5

-2.14

dBm

VoutSQ-SP

RX Peak Square Tone Level

GR=+3dB; Note 5

-0.76

dBm

V1

Square Wave Volume Control

See text for coefficient calculation

-30

0

dB

* Typical figures are at 25°C and are for design aid only; not guaranteed and not subject to production testing

Note 1:

In the transmit direction the sine tone level is controlled by the DGX register and the V2F bit.

Note 2:

In the transmit direction the DTMF level is controlled by the DGX register only.

Note 3:

In the transmit direction the square tone level is controlled by the V1 register and the DGX register. Levels

exceeding 3.14 dBm0 are limited by the transmit saturation logic to 3.14 dBm0.

Note 4:

In the receive direction the sine tone level is controlled by the V2 and the AGR register.

Note 5:

In the receive direction the square tone level is controlled by the V1, V2C and the AGR register.

#

Parameter

Symbol

Condition

Min

Typ

Max

Units

1

Frequency of Master Clock

tFMCLK

Note 1, 2

2.048

18.432

MHz

2

Width of SCLK High

tWCH

80

ns

3

Frequency of SCLK

1/tC

64

4096

KHz

4

Width of SCLK Low

tWCL

80

ns

5

Fall Time of SCLK

tFC

30

ns

6

Rise Time of SCLK

tRC

30

ns

7

Hold Time from SCLK High to

Short Strobe High

tHCSSH

0ns

8

Set Up Time from Short Strobe

High to SCLK Low

tSSSCL

30

ns