PUBLIC
29-Aug-18
Doc. DS-1211196 V1.10
WWW.CISSOID.COM
1 of 11
The Leader in High Temperature
Semiconductor Solutions
CHT-OPAL DATASHEET
Version: 1.10
General description
CHT-OPAL is an ultra high-precision, dual
operational amplifier designed for applica-
tions that require very low offset and very
low noise. Both amplifiers can be configured
as a differential amplifier or as an instru-
mentation amplifier (combined with a third,
external amplifier cell and with external re-
sistors). Key features include single 5V
nominal power supply and rail-to-rail inputs
and outputs. Best-in-class precision on the
full temperature range -55°C to +225°C en-
compass low input offset (internally com-
pensated) and low noise. The internal cir-
cuitry uses a clock that is internally generat-
ed. There is a spread-spectrum mode for
this clock. The user can decide not to use
this internal clock and rather provide it from
external circuitry (e.g. for synchronization
purposes).
CHT-OPAL also features a Stand-by mode
that disables the two Op Amps and place
the circuit in a low power consumption mode
when the function is not needed.
-
+
-
+
CONFIG
VDD_D
NC
INN2
INP2
VDD_A2
VSS_A2
OUT2
VSS_D
CLK
ENABLE
INN1
INP1
VDD_A1
VSS_A1
OUT1
CONTROL
OPA2
OPA1
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Features
Junction operating temperature from
-55°C to 225°C
Single supply operation: 5V ±10%
Low offset: 50µV typ, 100 µV max
Low noise: 5 µVpp typ
High CMRR: 85 dB min
Product gain bandwidth: 2.8 MHz typ
Slew rate: 2.7 V/µs typ
Rail-2-rail input and output
Low bias input current: <10 pA typ
Quiescent current: 1.2 mA typ.
Automatic offset compensation
Stand-by current: 7 µA max
Latch-up free
For lower bias input current applica-
tions, contact CISSOID
Package: TDFP16
Validated at 225°C for 30000 hours
(and still on-going)
Applications
High temperature instrumentation &
data acquisition
Signal conditioning & instrumentation
amplifiers for temperature, pressure,
motion, speed and position sensors
Strain gage amplifiers
Photodiode and PMT amplifiers
Charge amplifiers
Current sensing
Transmitters (4-20mA, etc.)
CHT-OPAL–DATASHEET
PUBLIC
29-Aug-18
Doc. DS-1211196 V1.10
WWW.CISSOID.COM
2 of 11
Pinout
CONFIG
VDD_D
NC
INN2
INP2
VDD_A2
VSS_A2
OUT2
VSS_D
CLK
ENABLE
INN1
INP1
VDD_A1
VSS_A1
OUT1
VSS_A1
VSS_A1
Pin #
Pin Name
Pin Description
1
OUT1
Output OPA1
2
VSS_A1
Negative power supply Analog OPA1
3
VDD_A1
Positive power supply Analog OPA1
4
INP1
Positive input pin OPA1
5
INN1
Negative input pin OPA1
6
ENABLE
Enable input pin
1
7
CLK
Input clock signal
1
8
VSS_D
Negative power supply digital part
9
CONFIG
Configuration input pin
1
10
VDD_D
Positive power supply digital part
11
NC
Not connected internally; can be left floating or connected to any
net to ease PCB routing
12
INN2
Negative input pin OPA2
13
INP2
Positive input pin OPA2
14
VDD_A2
Positive power supply Analog OPA2
15
VSS_A2
Negative power supply Analog OPA2
16
OUT2
Output OPA2
The 2 vertical large leads are internally connected to VSS_A1 and are also connected to the pack-
age heat sink.
1
Cfr “Mode of operations” for details about function of pins “CLK”, “CONFIG” and “ENABLE”