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10
M-8888
Rev. 1
Electrical Characteristics - Gain Setting Amplifier
Parameter Symbol Min Typ* Max Units
Input leakage current (V
SS
≤ V
IN
≤ V
DD
)I
IN
- 100 - nA
Input resistance R
IN
-10 -MΩ
Input offset voltage V
OS
-25 -mV
Power supply rejection (1 KHz) PSRR - 60 - dB
Common mode rejection (-3.0 V≤ V
IN
≤ 3.0V) CMRR - 60 - dB
DC open-loop voltage gain A
VOL
-65 -dB
Unity gain bandwidth BW - 1.5 - MHz
Output voltage swing (R
L
≥ 100 KΩ to V
SS
)V
O
- 4.5 - V
PP
Maximum capcitive load, GS C
L
- 100 - pF
Maximum resistive load, GS R
L
-50 -kΩ
Common mode range (no load) V
CM
- 3.0 - V
PP
All voltages referenced to V
SS
unless otherwise noted. V
DD
= 5.0V ± 5%; V
SS
= 0 V; f
C
= 3.579545 MHz; T
A
= -40°C to +85°C
*Typical values are for use as design aids only, and are not guaranteed or subject to production testing.
Timing Diagrams
AC Characteristics (Continued)
Parameter Symbol Min Typ* Max Units
DTMF Clock
Crystal clock frequency f
C
3.5759 3.5795 3.5831 MHz
Clock input rise time (external clock) t
LHCL
- - 110 ns
Clock input fall time (external clock) t
HLCL
- - 100 ns
Clock input duty cycle (external clock) DC
CL
40 50 60 %
Capacitive load, OSC2 C
LO
--30pF
Voltages referenced to V
SS
unless otherwise noted. V
DD
= 5.0V ± 5%; V
SS
= 0 V; f
C
= 3.579545 MHz; T
A
= -40°C to +85°C
*Typical values are for use as design aids only and are not guaranteed or subject to production testing.
Notes:
1. dBm = decibels above or below a reference power of 1 mW into a 600 Ω load.
2. Digit sequence consists of all 16 DTMF tones.
3. Tone duration = 40 ms. Tone pause = 40 ms.
4. Nominal DTMF frequencies are used.
5. Both tones in the composite signal have an equal amplitude.
6. The tone pair is deviated by ± 1.5% ± 2 Hz.
7. Bandwidth limited (3 kHz) Gaussian noise.
8. The precise dial tone frequencies are 350 and 440 Hz (± 2%).
9. For an error rate of less than 1 in 10,000.
10. Referenced to the lowest amplitude tone in the DTMF signal.
11. Referenced to the minimum valid accept level.
