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HT9274(14SOP) [ETC]

Operational Amplifier ; 运算放大器\n
HT9274(14SOP)
型号： HT9274(14SOP)
厂家： ETC    ETC
描述：

Operational Amplifier
运算放大器\n

运算放大器 LTE
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HT9274  
Quad Micropower Op Amp  
Features  
·
·
·
·
·
·
·
Quad micro power op amp  
·
·
·
Common mode input extends below nega-  
tive rail  
Wide range of supply voltage: 1.6V~5.5V  
High input impedance  
Single supply operation  
Pin compatible with LM324/WT274 (14-pin  
DIP)  
14-pin DIP/SOP package  
Low current consumption: < 5mA per amp  
Rail to rail output  
Provides both sink and source output drive  
capability  
Applications  
·
·
·
·
Battery powered system  
Sensor amplifier  
·
·
·
·
Signal detectors  
Active filters  
Low power gain blocks  
Low power comparators  
Caller ID systems  
Communication systems  
General Description  
The HT9274 is a CMOS quad micro-power op-  
erational amplifier featuring high input imped-  
ance, extremely low power, high gain and high  
stability.  
gain, low frequency, low power applications, es-  
pecially ideal for battery powered systems  
where mA range of standby current is essential  
for long battery life span. For example, in  
multi-standard Caller ID systems, HT9274 is  
ideal as a low power line signal monitor/detec-  
tor, and in car alarm systems, the HT9274 is ex-  
cellent for piezo vibratile detector signal  
amplifier application.  
It allows common mode input voltage range  
which extends below the negative rail, output  
swings to both rails with a reasonable sink and  
souce capability of the output drive current.  
This cost-effective device is suitable for high  
Comparison Table  
Output  
Source  
Current  
Output  
Sink  
Current  
Max. load  
(To VDD  
or VSS)  
Operating Operating  
Current  
Input Bias  
Current  
ITEM  
GBW  
Voltage  
HT9274 1.6~5.5V  
WT274 1.35~10V  
1pA  
1pA  
0.1MHz  
0.1MHz  
1MHz  
5mA  
9mA  
500mA  
16mA  
500mA  
2mA  
>10kW  
>500kW  
>2kW  
LM324  
3~32V  
20mA  
8mA  
45nA  
400mA  
1
November 23, 1999  
HT9274  
Block Diagram  
1
O
U
T
4
4
4
V
3
3
3
O
I
I
U
S
U
T
1
I
-
N
-
N
N
1
2
I
I
N
N
+
+
+
+
V
D
D
S
I
I
O
N
N
-
2
I
-
N
T
2
O
U
T
Pin Assignment  
1
O
U
T
1
1
1
1
1
4
3
2
1
0
1
2
3
4
5
6
7
4
O
U
T
1
I
-
N
4
I
I
-
N
N
1
2
I
I
N
N
+
+
4
V
3
3
3
+
+
V
D
D
S
S
I
I
O
N
N
2
I
-
N
9
8
-
2
O
U
T
U
T
H
T
9
2
7
4
1
4
D
I
P
/
S
O
P
2
November 23, 1999  
HT9274  
Pin Description  
Internal  
Connection  
Pin No. Pin Name I/O  
Description  
1
2
1OUT  
1IN-  
1IN+  
VDD  
2IN+  
2IN-  
2OUT  
3OUT  
3IN-  
3IN+  
VSS  
O
I
CMOS OUT Output pin of the op amp 1  
PMOS IN  
PMOS IN  
¾
Inverting input pin of the op amp 1  
Noninverting input pin of the op amp 1  
Positive power supply  
3
I
4
¾
I
5
PMOS IN  
PMOS IN  
Noninverting input pin of the op amp 2  
Inverting input pin of the op amp 2  
6
I
7
O
O
I
CMOS OUT Output pin of the op amp 2  
CMOS OUT Output pin of the op amp 3  
8
9
PMOS IN  
PMOS IN  
¾
Inverting input pin of the op amp 3  
Noninverting input pin of the op amp 3  
Negative power supply  
10  
11  
12  
13  
14  
I
¾
I
4IN+  
4IN-  
4OUT  
PMOS IN  
PMOS IN  
Noninverting input pin of the op amp 4  
Inverting input pin of the op amp 4  
I
O
CMOS OUT Output pin of the op amp 4  
Absolute Maximum Ratings  
Supply Voltage.................................-0.3V to 6V  
Input Voltage.................VSS-0.3V to VDD+0.3V  
Storage Temperature.................-50°C to 125°C  
Operating Temperature ..............-20°C to 75°C  
Note: These are stress ratings only. Stresses exceeding the range specified under "Absolute Maxi-  
mum Ratings" 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 expo-  
sure to extreme conditions may affect device reliability.  
3
November 23, 1999  
HT9274  
Electrical Characteristics  
Ta=25°C  
Test Conditions  
VDD Conditions  
5V Vo=1.4V  
Symbol  
Parameter  
Min. Typ. Max.  
Unit  
VOS  
Input Offset Voltage  
5
mV  
¾
¾
¾
Temperature Coefficient of VOS  
5V  
5V  
2
DVOS/DT  
¾
¾
mV/°C  
Vi=Vo=1.4V  
-20°C<Ta<75°C  
IOS  
Input Offset Current  
Input Bias Current  
1
1
100  
150  
¾
pA  
pA  
V
¾
¾
Vi=Vo=1.4V  
-20°C<Ta<75°C  
Ib  
5V  
RL=1MW  
VIN+-VIN ³10mV  
VOUT+  
Positive Output Voltage Swing 5V  
Negative Output Voltage Swing 5V  
4.9 4.95  
RL=1MW  
IN--VIN+³10mV  
VOUT  
0.01 0.05  
V
¾
V
Vi=1.4V  
RL=1MW  
VO=1 to 4V  
AVOL  
Large Signal Voltage Gain  
Gain Band Width Product  
5V  
5V  
20  
200  
V/mV  
¾
RL=1MW  
CL=100pF  
GBW  
0.1  
80  
80  
MHz  
dB  
¾
60  
60  
¾
¾
¾
Vo=1.4V  
Vi=0V  
CMRR  
PSRR  
Common Mode Rejection Ratio 5V  
1.8~  
Power Supply Rejection Ratio  
5V  
Vo=1.4V  
Av=1  
dB  
Supply Current Per Single  
Amplifier  
ICC  
5V Vo=1.4V  
No load  
3
5
¾
mA  
SR  
Slew Rate at Unity Gain  
Phase Margin at Unity Gain  
5V No load  
0.03  
55  
¾
¾
¾
¾
V/ms  
RL=1MW  
5V  
Degree  
Fm  
CL=100pF  
f=1kHz  
RS=10W  
en  
nV / Hz  
Input Equivalent Noise Voltage 5V  
50  
å
å
V01/V02  
IOH  
Cross Talk Attenuation  
Output Source Current  
Output Sink Current  
5V  
5V  
5V  
100  
dB  
mA  
mA  
¾
¾
¾
¾
¾
VIN+-VIN-³10mV -300 -500  
300 500  
IOL  
V
IN--VIN+³10mV  
4
November 23, 1999  
HT9274  
Functional Description  
Input stage  
Output stage  
The input stage of op amps are nominal PMOS  
differential amplifiers (see the following dia-  
gram), therefore the common mode input volt-  
age can extend to VSS-0.6V. On the other hand  
the common mode input voltage has to be main-  
tained below (VDD-1)V to keep the input device  
(M2 and M3) active. This implies that when us-  
ing HT9274 as a voltage follower, the input 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  
The HT9274 uses push-pull CMOS configura-  
tion as the output stage of op amps to minimize  
low power consumption and to provide ade-  
quate output driving current.  
Note that the output is an unbuffered struc-  
ture, therefore the open loop gain will be af-  
fected by the load resistor since the voltage gain  
of this stage can be expressed as (gm5+  
gm6)´RL.  
V
D
D
VSS-0.6V to the input pins, otherwise the inter-  
nal input protection devices may be damaged.  
V
D
D
V
B
I
A
S
M
5
V
B
I
A
S
O
U
T
M
1
N
o
n
i
n
v
e
r
t
i
n
g
I
n
F
D
A
r
o
f
m
i
f
e
r
e
n
t
i
a
l
M
6
m
p
I
n
v
e
r
t
i
n
g
I
n
V
S
S
M
2
M
3
P
M
O
S
P
M
O
S
T
o
O
u
t
p
u
t
S
a
g
e
t Because of the consideration for minimized  
power consumption, the max. output current is  
limited to about 400mA for both source and sink  
drive. This is believed to be enough for most low  
power systems, however it is recommended to  
use the load resistor of >10kW for normal appli-  
cations. In case of heavy load driving, an exter-  
nal buffer stage using bipolar transistors is  
recommended.  
M
4
M
5
V
S
S
V
S
S
Since the input impedance of PMOS is inher-  
ently very high, it can directly couple to high  
impedance elements without loading effect. For  
example, coupling to ceramic transducers, inte-  
grating capacitor and resistor networks.  
The HT9274 is internally compensated for AC  
stability and capable to withstand up to a  
100pF capacitive load.  
Actually the extremly high input impedance is  
its major advantage over the bipolar counter-  
part, in some application fields such as integra-  
tors where the input current of op amp can  
cause significant error, the HT9274 is a better  
choice than the popular LM324.  
5
November 23, 1999  
HT9274  
Application Circuits  
Micro power sensor amplifier & detector  
V
D
D
9
8
1
1
0
4
5
6
D
E
T
_
O
U
T
3
7
S
E
N
S
O
R
1
2
1
1
3
2
1
1
4
Micro power line signal monitor  
V
D
D
2
3
T
I
P
1
4
1
5
6
7
R
I
N
G
D
E
T
_
O
U
T
1
V
B
I
A
S
Micro power line voltage monitor  
L
I
N
E
B
A
T
T
4
1
3
2
1
D
E
T
_
O
U
T
1
6
November 23, 1999  
HT9274  
Holtek Semiconductor Inc. (Headquarters)  
No.3, Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan  
Tel: 886-3-563-1999  
Fax: 886-3-563-1189  
Holtek Semiconductor Inc. (Taipei Office)  
11F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan  
Tel: 886-2-2782-9635  
Fax: 886-2-2782-9636  
Fax: 886-2-2782-7128 (International sales hotline)  
Holtek Semiconductor (Hong Kong) Ltd.  
RM.711, Tower 2, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Rd., Kowloon, Hong Kong  
Tel: 852-2-745-8288  
Fax: 852-2-742-8657  
Holtek Semiconductor (Shanghai) Ltd.  
7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China  
Tel: 021-6485-5560  
Fax: 021-6485-0313  
Holmate Technology Corp.  
48531 Warm Springs Boulevard, Suite 413, Fremont, CA 94539  
Tel: 510-252-9880  
Fax: 510-252-9885  
Copyright Ó 1999 by HOLTEK SEMICONDUCTOR INC.  
The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek  
assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are  
used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications  
will be suitable without further modification, nor recommends the use of its products for application that may pres-  
ent a risk to human life due to malfunction or otherwise. Holtek reserves the right to alter its products without prior  
notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw.  
7
November 23, 1999  

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