A5191HRT AMIS HART™ Modem
Table 7: AC Characteristics
Data Sheet
V
DD
= 3.0V to 5.5V, V
SS
= 0V, T
A
= -40°C to +85°C
Pin Name
IRXA
Description
Receive analog input
Leakage current
Frequency - mark (logic 1)
Frequency - space (logic 0)
Output of the high-pass filter
Slew rate
Gain bandwidth (GBW)
Voltage range
Carrier detect and receive filter input
Leakage current
Modulator output
Frequency - mark (logic 1)
Frequency - space (logic 0)
Amplitude (IAREF 1.235V)
Slope
Loading (IAREF = 1.235V)
Receive digital output
Rise/fall time
Carrier detect output
Rise/fall time
Min.
Typ.
Max.
+150
1210
2220
Units
nA
Hz
Hz
1190
2180
1200
2200
ORXAF
150
0.15
0.025
V/ms
kHz
V
DD
- 0.15 V/ms
+500
nA
Hz
Hz
mV
p-p
mV/ms
kW
ns
ns
IRXAC
OTXA
30
20
20
1196.9
2194.3
500
2.79
ORXD
OCD
The modular output frequencies are proportional to the input clock frequency (460.8kHz).
Table 8: Modem Characteristics
V
DD
= 3.0V to 5.5V, V
SS
= 0V, T
A
= -40°C to +85°C
Parameter
Demodulator Jitter
Conditions
1. Input frequencies at 1200Hz + 10Hz, 2200Hz + 20Hz
2. Clock frequency of 460.8kHz + 0.1%
3. Input (HLXA) asymmetry, 0
Min.
Typ.
Max.
12
Units
% of 1 bit
Table 9: Ceramic Resonator - External Clock Specifications
V
DD
= 3.0V to 5.5V, V
SS
= 0V, T
A
= -40°C to +85°C
Parameter
Resonator
Tolerance
Frequency
External
Clock frequency
Duty cycle
Amplitude
Min.
Typ.
Max.
Units
%
kHz
kHz
%
V
460.8
460.8
50
V
OH
- V
OL
1.0
456.2
40
465.4
60
AMI Semiconductor - Rev. 2.0, Mar. 05
www.amis.com
9
AMI [ AMI SEMICONDUCTOR ]
