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HT9291/HT9292/HT9294
TinyPowerTM Operation Amplifier
Features
· Wide operating voltage: 1.4V to 5.5V
· Low quiescent current: typical 0.6mA/amplifier
· Rail-to-Rail output
· Gain bandwidth: 11kHz typical
· Unity gain stable
Applications
· Wearable products
· Temperature measurement
· Battery powered products
· Available in Single, Dual and Quad OP¢s package
types
· Package type:
HT9291: TSOT23-5
HT9292: 8-pin DIP/SOP
HT9294: 14-pin DIP/SOP
· Portable equipment
· Low power sensors
General Description
The Holtek HT9291/HT9292/HT9294 range of Low
Power Operation Amplifiers offer the advantage of a sin-
gle supply voltage down to as low as 1.4V as well as the
advantages of an extremely low quiescent current of
only 0.6mA/amplifier. One other major advantage of
these devices lie in their rail-to-rail voltage operation for
maximum range. The devices also provide a typical gain
bandwidth product of 11kHz and are also unity gain sta-
ble. The devices are available in a range of packages
according the number of internal amplifiers. The special
characteristics of these devices will ensure their excel-
lent use in applications with stringent low power de-
mands such as portable products, battery powered
equipment, low power sensor signal processing etc.
Selection Table
Part No.
Amplifiers
HT9291
1
HT9292
2
HT9294
4
Package
TSOT23-5
8DIP/SOP
14DIP/SOP
Block Diagram
1O U T
1 IN -
1 IN +
VDD
2 IN +
2 IN -
2O U T
4O U T
4 IN -
4 IN +
VSS
3 IN +
3 IN -
3O U T
Rev. 1.10
1 October 12, 2010
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HT9291/HT9292/HT9294
Pin Assignment
VDD
IN -
O U T V S S IN +
H T9291
T S O T 2 3 -5
1O U T
1 IN -
1 IN +
VSS
1
2
3
4
8
7
6
5
H T9292
8 D IP -A /S O P -A
VDD
2O U T
2 IN -
2 IN +
1O U T
1 IN -
1 IN +
VDD
2 IN +
2 IN -
2O U T
1
2
3
4
5
6
7
14 4O U T
1 3 4 IN -
1 2 4 IN +
11 V S S
1 0 3 IN +
9 3 IN -
8 3O U T
H T9294
1 4 D IP -A /S O P -A
Pin Descriptions
HT9291
Pin No. Pin Name
1 OUT
2 VSS
3 IN+
4 IN-
5 VDD
Analog output
Negative power supply
Non-inverting input
Inverting input
Positive power supply
Description
HT9292
Pin No.
1
2
3
4
5
6
7
8
Pin Name
1OUT
1IN-
1IN+
VSS
2IN+
2IN-
2OUT
VDD
Description
Analog output (operation amplifier 1)
Inverting input (operation amplifier 1)
Non-inverting input (operation amplifier 1)
Negative power supply
Non-inverting input (operation amplifier 2)
Inverting input (operation amplifier 2)
Analog output (operation amplifier 2)
Positive power supply
HT9294
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin Name
1OUT
1IN-
1IN+
VDD
2IN+
2IN-
2OUT
3OUT
3IN-
3IN+
VSS
4IN+
4IN-
4OUT
Description
Analog output (operation amplifier 1)
Inverting input (operation amplifier 1)
Non-inverting input (operation amplifier 1)
Positive power supply
Non-inverting input (operation amplifier 2)
Inverting input (operation amplifier 2)
Analog output (operation amplifier 2)
Analog output (operation amplifier 3)
Inverting input (operation amplifier 3)
Non-inverting input (operation amplifier 3)
Negative power supply
Non-inverting input (operation amplifier 4)
Inverting input (operation amplifier 4)
Analog output (operation amplifier 4)
Rev. 1.10
2 October 12, 2010
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HT9291/HT9292/HT9294
Absolute Maximum Ratings
Supply Voltage .......................................................6.0V
Difference Input Voltage ..............................±(VDD-VSS)
Storage Temperature .........................-65°C to +150°C
Junction Temperature ..........................................150°C
Input Voltage..............................VSS-0.3V ~ VDD+0.3V
ESD protection on all pins (HBM;MM) ........³4kV; 400V
Operating Temperature ........................-40°C to +85°C
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed
in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
Electrical Characteristics
Unless otherwise indicated, VSS=GND, Ta=25°C, VCM=VDD/2, VL=VDD/2, and RL=1MW to VL, CL=60pF
Symbol
Parameter
Test Conditions
VDD Conditions
Min. Typ. Max. Unit
VDD Supply Voltage
¾¾
1.4 ¾ 5.5 V
VOS Input Offset Voltage
5V VIN=VCM/2
-5.0 ¾
5.0 mV
DVOS/DT Drift with Temperature
5V VIN=VCM/2
¾ ±2 ¾ mV/°C
IOS Input Offset Current
5V Ta=25°C
¾ ±5 ¾ pA
IB Input Bias Current
5V Ta=25°C
¾ ±50 ¾
pA
VCM
Input Common Mode Range
5V ¾
0 ¾ VDD-1.2 V
VOH
VOL
Maximum Output Voltage Swing
0.5V input overdrive
RL=1MW to VL
5V
0.5V input overdrive
RL=50kW to VL
VSS+10 ¾ VDD-10 mV
VSS+20 ¾ VDD-50 mV
AOL
DC Open-Loop Gain
(large signal)
5V
VOUT=0.2V to VDD-0.2V,
VIN=VCM/2
70 100 ¾
dB
GBW
Gain BandWidth Product
5V RL=1MW, CL=60pF
VIN=VCM/2
¾ 11 ¾ kHz
Fm Phase Margin
5V RL=1MW, CL=60pF
G=+1V/V, VIN+= VDD/2
¾ 50 ¾
°
CMRR
Common Mode Rejection Ratio 5V VCM=0V to VDD-1.4V
60 90 ¾ dB
PSRR
Power Supply Rejection Ratio 5V VCM = 0.2V
65 95 ¾ dB
ICC
Supply Current Per Single
Amplifier
Io=0A for HT9291
0.50
5V
Io=0A for HT9292/HT9294 0.30
0.80
0.60
1.20
1.00
mA
mA
SR Slew Rate at Unity Gain
IO_SOURCE
Output Short Circuit Source
Current
5V RL=1MW, CL=60pF
5V VIN+ - VIN- ³ 10mV
¾5
-0.3 -1.2
¾ V/ms
¾ mA
IO_SINK
Output Short Circuit Sink Current 5V VIN- - VIN+ ³ 10mV
1 4 ¾ mA
Rev. 1.10
3 October 12, 2010
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HT9291/HT9292/HT9294
Functional Description
Input Stage
The input stage of op amps are nominal PMOS differen-
tial amplifiers (see the following diagram), therefore the
common mode input voltage can extend to VSS-0.6V.
On the other hand the common mode input voltage has
to be maintained below (VDD-1.2V) to keep the input de-
vice (M2 and M3) active. This implies that when using
HT9291/HT9292/HT9294 as a voltage follower, the in-
put as well as output active range will be limited be-
tween VSS~VDD-1V (approx.). Avoid applying any
voltage greater than VDD+0.6V or less than VSS-0.6V to
the input pins, otherwise the internal input protection de-
vices may be damaged.
V DD
M1
N o n in v e r tin g In
V B IA S
In v e r tin g In
M2
PM O S
M3
PM O S
T o O u tp u t S ta g e
M4
V SS
M5
V SS
Since the input impedance of PMOS is inherently very
high, it can directly couple to high impedance elements
without loading effect. For example, coupling to ceramic
transducers, integrating capacitor and resistor net-
works.
Actually the extremly high input impedance is its major
advantage over the bipolar counterpart, in some appli-
cation fields such as integrators where the input current
of op amp can cause significant error.
Output Stage
The HT9291/HT9292/HT9294 uses push-pull CMOS
configuration as the output stage of op amps to mini-
mize low power consumption and to provide adequate
output driving current.
Note that the output is an unbuffered structure, therefore
the open loop gain will be affected by the load resistor
since the voltage gain of this stage can be expressed as
(gm5+ gm6)´RL.
V DD
V B IA S
F ro m
D iffe r e n tia l
Am p
M5
OUT
M6
V SS
Because of the consideration for minimized power con-
sumption, the output short circuit current is limited to
about -1.2mA for source drive and 4mA for sink drive.
This is believed to be enough for most low power sys-
tems, however it is recommended to use the load resis-
tor of >1MW for normal applications. In case of heavy
load driving, an external buffer stage using bipolar tran-
sistors is recommended.
The HT9291/HT9292/HT9294 is internally compen-
sated for AC stability and capable to withstand up to a
60pF capacitive load.
Rev. 1.10
4 October 12, 2010
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HT9291/HT9292/HT9294
Application Circuits
High Side Battery Current Sensor
IIN 1 0 k W
V IN
100kW
1M W
I IN
=
V D D -V
(1 1 V /V ) x
OUT
(1 0 k W
)
Two Op Amp Instrumentation Amplifier
V REF
R1
RG
R2
R2
V DD
V OUT
R1
V OUT
V1 V2
1 /2
H T9294
1 /2
H T9294
V O U T = (V 2-V 1) x (1 +
R1
R2
+
2R 1
RG
)
+
V REF
Rev. 1.10
5 October 12, 2010
Datasheet pdf - http://www.DataSheet4U.net/