ST3917A datasheet(7/16 Pages) STMICROELECTRONICS

7 / 16 page

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

ZDTMF

DTMF Attenuation Pin Impedance

Ω

GRX

Receive gain (see Figure 11)

VINP = 4mVRMS,

RE = 300

Ω,RGRX=100kΩ

ILN = 15mA

ILN = 60mA

29.5

23.0

31.0

25.0

32.5

27.0

AGRX

Receive Gain Variation (see Figure 11)

VINP = 4mVRMS,

RE = 300

Ω,ILN = 15MA

RGRX = 10K

Ω

RGRX = 300k

Ω

-20

+10

DRX

Receive Distortion (see Figure 11)

ILN = 15mA, RGRX=100k

Ω

RE = 150

Ω,VEAR = 0.25VRMS

RE = 300

Ω,VEAR = 0.45VRMS

RE = 450

Ω,VEAR = 0.55VRMS

NRX

Receive Noise (see Figure 11)

ILN = 15mA, RE = 300

Ω

RGRX = 100k

Ω,VINP =0V

200

µV

ZOUT

Receive Output Impedance

(see Figure 11)

ILN = 15mA

Ω

VPT

Pacifier Tone Level on Earphone

(see Figure 11)

ILN = 15mA

RP =

∞

RP = 430k

Ω

600

mVRMS

TKD

FKS

KRU

KRD

Keyboard Interface

Keypad Debounce Time

Keypad Scan Frequency

Keypad Pullup Resistance

Keypad Pulldown Resistance

See Figures 4 and 5

250

100

500

Ω

TRIS

TPSD

TISD

TDUR

Tone Mode

Tone Output Rise Time

Tone Signalling Rate

Presignal Delay

Intersignal Delay

Tone Output Duration

See Figures 2 and 3

5.55

5ms

1/sec

TPT

FPT

IDP

PDP

Pulse Mode

Pacifier Tone Duration

Pacifier Tone Frequency

Pulse Rate

Break Time :

ST3917A

ST3917B

Make Time :

ST3917A

ST3917B

Interdigital Pause

Predigital Pause :

ST3917A

ST3917B

See Figures 4 and 5

500

820

PPS

Option Selectable

Symbol

Parameter

Option 1

SEL = VDD

Option 2

SEL = GND

Option 3

SEL = ROW

Option 4

SEL = COL

Unit

tFLASH

Timed Hook Flash (see Figures 2 and3)

100

600

300

100

Notes : 1. All inputs unloaded. Quiescent mode (oscillator off).

2. Pulse output sink current for VOUT = 0.5V at VDD = 3V.

3. Pacifier tone sink current for VOUT = 0.5V, source current for VOUT = 2.5V at VDD = 3V.

4. Memory retention voltage is the point where memory is guaranteed but circuit operation is not. Proper memory retention is

guaranteed if either the minimum IMR is provided or the minimum VMR. The design does not have to provide both the minimum

current and voltage.

5. Option 1 is with softswitch inhibition.

ELECTRICAL CHARACTERISTICS (continued)

(ILN = 10mA to 120mA, f = 1kHz, Tamb =25

°C, VDD = 3V ; unless otherwise specified)

ST3917A - ST3917B

7/16

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