參數資料
| 型號： | ISL28268FUZ-T7 |
| 廠商： | Intersil |
| 文件頁數： | 4/17頁 |
| 文件大小： | 0K |
| 描述： | IC OP AMP DUAL RRIO 34UA 8-MSOP |
| 標準包裝： | 1,500 |
| 放大器類型： | 通用 |
| 電路數： | 2 |
| 輸出類型： | 滿擺幅 |
| 轉換速率： | 0.1 V/µs |
| 增益帶寬積： | 200kHz |
| -3db帶寬： | 420kHz |
| 電流 - 輸入偏壓： | 10pA |
| 電壓 - 輸入偏移： | 90µV |
| 電流 - 電源： | 34µA |
| 電流 - 輸出 / 通道： | 30mA |
| 電壓 - 電源，單路/雙路(±)： | 2.4 V ~ 5.5 V，±1.2 V ~ 2.75 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 8-MSOP |
| 包裝： | 帶卷 (TR) |
12
FN6378.4
July 25, 2011
Applications Information
Introduction
The ISL28168 is a single CMOS rail-to-rail input, output
(RRIO) operational amplifier with an enable feature. The
ISL28268 is a dual version without the enable feature. Both
devices are designed to operate from single supply (2.4V to
5.5V) or dual supplies (±1.2V to ±2.75V).
Rail-to-Rail Input/Output
Many rail-to-rail input stages use two differential input pairs,
a long-tail PNP (or PFET) and an NPN (or NFET). Severe
penalties have to be paid for this circuit topology. As the
input signal moves from one supply rail to another, the
operational amplifier switches from one input pair to the
other causing drastic changes in input offset voltage and an
undesired change in magnitude and polarity of input offset
current.
The ISL28168 and ISL28268 achieve input rail-to-rail
operation without sacrificing important precision
specifications and degrading distortion performance. The
devices’ input offset voltage exhibits a smooth behavior
throughout the entire common-mode input range. The input
bias current versus the common-mode voltage range gives
us an undistorted behavior from typically 100mV below the
negative rail, and 0.25V higher than the V+ rail. The CMOS
output stage features excellent drive capability, typically
swinging to within 6mV of either rail with a 100k
Ω load.
Results of Over-Driving the Output
Caution should be used when over-driving the output for
long periods of time. Over-driving the output can occur in two
ways.
1. The input voltage times the gain of the amplifier exceeds
the supply voltage by a large value
FIGURE 37. VOUT LOW vs TEMPERATURE, V+, V- = ±2.5V,
RL = 1k
FIGURE 38. VOUT LOW vs TEMPERATURE, V+, V- = ±2.5V,
RL = 100k
FIGURE 39. IO+ SHORT CIRCUIT OUTPUT CURRENT vs
TEMPERATURE, VIN = -2.55V, RL = 10k,
V+, V- = ±2.5V
FIGURE 40. IO- SHORT CIRCUIT OUTPUT CURRENT vs
TEMPERATURE, VIN = +2.55V, RL = 10k,
V+, V- = ±2.5V
Typical Performance Curves V+ = 5V, V- = 0V, VCM = 2.5V, RL = Open (Continued)
100
110
120
130
140
150
160
170
180
190
-40
-20
0
20406080
100
120
TEMPERATURE (°C)
MAX
N = 1000
MIN
MEDIAN
V
OU
T
(mV
)
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
V
OU
T
(m
V
)
MEDIAN
MAX
N = 1000
MIN
20
25
30
35
40
45
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
I O
+
SHORT
C
IRCUIT
CURR
E
N
T
(mA)
MEDIAN
MAX
N = 1000
MIN
-32
-30
-28
-26
-24
-22
-20
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
I O
-SHORT
CIRCUIT
CURRENT
(m
A)
MEDIAN
MAX
N = 1000
MIN
ISL28168, ISL28268
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