MAXIM MAX44260

19-5873; Rev 3; 2/12
备有评估板
MAX44260/MAX44261
1.8V、15MHz低失调、低功耗、
满摆幅I/O运算放大器
概述
特性
MAX44260/MAX44261具有高速、高精度、低噪声、低电
压特性，可理想用于便携设备和工业设备中的大多数信号
处理功能，如：信号滤波和放大。
S 在-40℃至+125℃范围采用1.8V低压供电
在0℃至+70℃范围采用1.7V供电
放大器具有小于50µV的输入失调电压，在1.8V电源电压下
保证了15MHz高增益带宽积。器件的满摆幅输入/输出以
及低噪声特性确保满足12位至14位SAR ADC驱动的最大
动态范围要求。与传统的满摆幅输入架构不同，由于采用
低噪电荷泵对输入级进行优化，输入没有交越失真。
S 低输入电压噪声密度：12.7nV/√Hz
为进一步降低功耗，MAX44260具有快速上电关断模式；
MAX44261提供了一个独特的按需校准引脚，用户可触发
调节输入失调电压。
S 低输入偏置电流：500fA
该系列器件采用1.8V至5.5V供电，工作在-40℃至+125℃
温度范围，在0℃至+70℃范围内，工作电压可低至1.7V。
MAX44260/MAX44261采用小尺寸、6引脚SC70封装，
MAX44260还提供1mm x 1.5mm、薄型µDFN (超薄LGA)
封装。
S 15MHz单位增益带宽
S 低输入电流噪声密度：1.2fA/√Hz
S +25℃下，VOS低至50µV (最大值)
S 按需校准VOS (MAX44261)
S 每路放大器静态电流：750µA
S 关断模式下电源电流小于1µA
S 小尺寸、2mm x 2mm SC70和1mm x 1.5mm、薄型
µDFN (MAX44260)封装
S 总谐波失真低至110dB
应用
笔记本电脑
定购信息在数据资料的最后给出。
3G/4G手机
便携式媒体播放器
便携式医疗设备
电池供电设备
模/数转换器缓冲器
互阻放大器
通用信号处理器
典型应用电路
15nF
+3.3V
2.4kI
22kI
MAX44260
330pF
10kI
3.3nF
CORNER FREQUENCY = 10kHz
ADC
MAX11645
SALLEN-KEY FILTER
相关型号以及配合该器件使用的推荐产品，请参见：china.maxim-ic.com/MAX44260.related
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本文是英文数据资料的译文，文中可能存在翻译上的不准确或错误。如需进一步确认，请在您的设计中参考英文资料。
有关价格、供货及订购信息，请联络Maxim亚洲销售中心：10800 852 1249 (北中国区)，10800 152 1249 (南中国区)，
或访问Maxim的中文网站：china.maxim-ic.com。
MAX44260/MAX44261
1.8V、15MHz低失调、低功耗、
满摆幅I/O运算放大器
ABSOLUTE MAXIMUM RATINGS
IN+, IN-, OUT..................................(VSS - 0.3V) to (VDD + 0.3V)
VDD to VSS................................................................-0.3V to +6V
SHDN, CAL..............................................................-0.3V to +6V
Output to Short-Circuit Ground Duration............................... 10s
Continuous Input Current into Any Pin............................. Q20mA
Continuous Power Dissipation (TA = +70NC)
SC70 (derate 3.1mW/NC above +70NC).......................245mW
6-Pin Thin µDFN (Ultra-Thin LGA)
(derate 2.1mW/NC above +70NC)..............................110.2mW
Operating Temperature Range......................... -40NC to +125NC
Junction Temperature......................................................+150NC
Lead Temperature (soldering, 10s).................................+300NC
Soldering Temperature (reflow).......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
SC70
Junction-to-Ambient Thermal Resistance (BJA)..... 326.5NC/W
Junction-to-Case Thermal Resistance (BJC)..............115NC/W
Thin µDFN (Ultra-Thin LGA)
Junction-to-Ambient Thermal Resistance (BJA)........ 470NC/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to china.maxim-ic.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are
at TA = +25NC, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
VDD
+ 0.1
V
DC CHARACTERISTICS
Input Voltage Range
VIN+ VIN-
Input Offset Voltage
VOS
Guaranteed by CMRR test
-0.1
TA = +25NC
Input Offset Voltage Drift
10
100
TA = -40°C to +125°C
500
VOS - TC
TA = +25NC
Input Bias Current
Input Capacitance
Common-Mode Rejection Ratio
Open-Loop Gain
IB
AOL
Output Short-Circuit Current
ISC
0.8
5
0.01
0.5
TA = -40NC to +85NC
10
TA = -40NC to +125NC
100
CIN
CMRR
50
TA = -40°C to +125°C after calibration
FV
FV/NC
pA
0.4
pF
dB
VCM = -0.1V to (VDD + 0.1V)
75
90
0.4V P VOUT P VDD - 0.4V, ROUT = 10kI
100
115
0.4V P VOUT P VDD - 0.4V, ROUT = 600I
91
100
0.4V P VOUT P VDD - 0.4V, ROUT = 32I
80
To VDD or VSS
50
dB
mA
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MAX44260/MAX44261
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
1.8V、15MHz低失调、低功耗、
Low-Power, Rail-to-Rail
I/O Op Amps
满摆幅I/O运算放大器
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are
at TA = +25NC, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
VOL VSS
Output Voltage Swing
VDD VOH
CONDITIONS
MIN
TYP
MAX
UNITS
20
ROUT = 10kI
50
ROUT = 600I
400
ROUT = 32I
700
10
ROUT = 10kI
mV
40
ROUT = 600I
ROUT = 32I
400
800
AC CHARACTERISTICS
Input Voltage-Noise Density
en
f = 10kHz
12.7
nV/√Hz
Input Current-Noise Density
in
f = 10kHz
1.2
fA/√Hz
GBWP
15
MHz
SR
7
V/Fs
VOUT = 2VP-P, VDD = 3.3V, AV = 1V/V,
CL = 30pF (load), settle to 0.01%
1.7
μs
µs
No sustained oscillation
300
pF
f = 10kHz, VO = 2VP-P, AV = 1, ROUT = 10kI
-110
dB
1
μs
µs
Gain-Bandwidth Product
Slew Rate
Settling Time
Capacitive Loading
Total Harmonic Distortion
CLOAD
THD
DVOUT = 0.2V, VDD = 3.3V, AV = 1V/V;
V
RS = 20Ω,
20Ω, CL = 1nF (load)
Output Transient Recovery Time
POWER-SUPPLY CHARACTERISTICS
Power-Supply Range
Power-Supply Rejection Ratio
Quiescent Current
Shutdown Supply Current
VDD
PSRR
1.8
5.5
TA = 0NC to +70NC
1.7
5.5
VCM = VDD/2
82
IDD
ISHDN
Shutdown Input Low
VIL
Shutdown Input High
VIH
Output Leakage Current in
Shutdown
ISHDN
Shutdown Input Bias Current
IIL/IIH
Shutdown Turn-On Time
tSHDN
Turn-On Time
Guaranteed by PSRR
tON
95
750
MAX44260/MAX44261 only
dB
1200
μA
µA
1
μA
µA
0.7
1.3
pA
MAX44260
1
MAX44261
0.1
TA = -40C to +125C (Note 3)
TA = +25NC (Note 3)
V
V
100
TA = +25NC (Note 3)
V
14.4
18.9
26.7
9.7
TA = -40C to +125C (Note 3)
15.2
18.4
μA
µA
μs
ms
Note 2: All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.
Note 3: Guaranteed by design.
_________________________________________________________________ Maxim Integrated Products
3
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Products 3
MAX44260/MAX44261
1.8V、15MHz低失调、低功耗、
满摆幅I/O运算放大器
典型工作特性
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are at
TA = +25NC, unless otherwise noted. All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.)
INPUT OFFSET VOLTAGE
vs. SUPPLY VOLTAGE
20
TA = -40°C
0
-20
TA = +25°C
0
0.5
1.0
1.5
2.0
2.5
20
TA = +25°C
0
-20
-40
TA = +125°C
-60
MAX44260 toc03
15
10
5
-100
3.5
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0
5.5
-15 -10
-5
0
5
10
15
20
SUPPLY VOLTAGE (V)
INPUT OFFSET VOLTAGE (µV)
INPUT OFFSET DRIFT HISTOGRAM
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
OUTPUT-VOLTAGE LOW
vs. OUTPUT SINK CURRENT
(VOL - VEE, VCC = 1.8V)
12
10
8
6
4
80
60
40
TA = +25°C
20
0
-20
TA = -40°C
-40
-60
2
-80
0
-100
-1.5 -1 -0.5
0
0.50 1.00
-1.8 -1.3 -0.8 -0.3 0.25 0.75 1.25
INPUT OFFSET DRIFT (µV/°C)
TA = +85°C
TA = +125°C
200
25
MAX44260 toc06
14
100
180
OUTPUT-VOLTAGE LOW (mV)
MAX44260 toc04
16
-2
20
COMMON-MODE VOLTAGE (V)
18
PERCENT OCCURRENCE (%)
3.0
INPUT BIAS CURRENT (pA)
-0.5
40
25
-80
TA = +125°C
-60
TA = -40°C
60
MAX44260 toc05
-40
80
MAX44260 toc02
40
INPUT VOS HISTOGRAM
100
INPUT OFFSET VOLTAGE (µV)
MAX44260 toc01
INPUT OFFSET VOLTAGE (µV)
60
PERCENT OCCURRENCE (%)
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
160
140
120
TA = +25°C
100
80
TA = +125°C
60
TA = -40°C
40
20
0
-0.5
0
0.5
1.0
1.5
2.0
2.5
COMMON-MODE VOLTAGE (V)
3.0
3.5
0.1
1
10
OUTPUT SINK CURRENT (mA)
100
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MAX44260/MAX44261
1.8V、15MHz低失调、低功耗、
满摆幅I/O运算放大器
典型工作特性(续)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are at
TA = +25NC, unless otherwise noted. All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.)
OUTPUT-VOLTAGE LOW
vs. OUTPUT SINK CURRENT
(VOL - VEE, VCC = 5V)
TA = +25°C
120
100
80
TA = +125°C
60
40
20
1
10
OUTPUT SINK CURRENT (mA)
140
TA = +25°C
120
100
80
TA = +125°C
60
40
20
TA = -40°C
0
0.1
140
TA = +25°C
120
100
80
TA = +125°C
60
TA = -40°C
40
20
1
10
OUTPUT SINK CURRENT (mA)
1
10
OUTPUT SOURCE CURRENT (mA)
80
100
TA = +125°C
60
TA = -40°C
40
0.1
180
160
140
SUPPLY CURRENT vs. SUPPLY VOLTAGE
TA = +25°C
120
100
80
TA = +125°C
60
TA = -40°C
40
0.1
1
10
OUTPUT SOURCE CURRENT (mA)
100
1
10
OUTPUT SOURCE CURRENT (mA)
900
MAX44260 toc11
200
850
TA = +25°C
800
TA = +125°C
750
700
TA = -40°C
650
0
0.1
100
100
20
0
TA = +25°C
120
0
0.1
OUTPUT-VOLTAGE HIGH (mV)
160
140
OUTPUT-VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
(VCC - VOH, VCC = 5V)
MAX44260 toc10
OUTPUT-VOLTAGE HIGH (mV)
180
160
20
TA = -40°C
OUTPUT-VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
(VCC - VOH, VCC = 3.3V)
200
180
0
100
MAX44260 toc09
160
200
MAX44260 toc12
140
180
SUPPLY CURRENT (µA)
160
200
MAX44260 toc08
OUTPUT-VOLTAGE LOW (mV)
180
OUTPUT-VOLTAGE LOW (mV)
MAX44260 toc07
200
OUTPUT-VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
(VCC - VOH, VCC = 1.8V)
OUTPUT-VOLTAGE HIGH (mV)
OUTPUT-VOLTAGE LOW
vs. OUTPUT SINK CURRENT
(VOL - VEE, VCC = 3.3V)
100
600
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
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MAX44260/MAX44261
1.8V、15MHz低失调、低功耗、
满摆幅I/O运算放大器
典型工作特性(续)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are at
TA = +25NC, unless otherwise noted. All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.)
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
(VSHDN = VEE)
0.6
0.5
TA = -40°C
0.4
TA = +25°C
0.3
0.2
MAX44260 toc15
100
-20
80
-40
CMRR (dB)
0.7
0
MAX44260 toc14
TA = +125°C
OPEN-LOOP GAIN (dB)
0.9
0.8
120
MAX44260 toc13
SHUTDOWN SUPPLY CURRENT (µA)
1.0
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
OPEN-LOOP GAIN
vs. FREQUENCY
60
-60
40
-80
20
-100
0.1
0
0.001 0.01
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
1
10
100
1k
10k 100k
0
1
10
100
1k
10k
FREQUENCY (kHz)
FREQUENCY (kHz)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
DC CMRR AND PSRR
vs. TEMPERATURE
INPUT VOLTAGE-NOISE DENSITY
vs. FREQUENCY
REJECTION RATIO (dB)
-40
-60
-80
DC CMRR
-94
-96
-98
-100
DC PSRR
-100
-120
0.1
1
10
100
FREQUENCY (kHz)
1k
10k
100k
100k
MAX44260 toc18
-92
500
INPUT-VOLTAGE NOISE DENSITY (nV/√Hz)
-90
MAX44260 toc16
-20
0.01
0.01
SUPPLY VOLTAGE (V)
0
PSRR (dB)
-120
0
MAX44260 toc17
1.5
450
400
350
300
250
200
150
100
50
0
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
0.01
0.1
1
10
100
1k
10k
FREQUENCY (kHz)
����������������������������������������������������������������� Maxim Integrated Products 6
MAX44260/MAX44261
1.8V、15MHz低失调、低功耗、
满摆幅I/O运算放大器
典型工作特性(续)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are at
TA = +25NC, unless otherwise noted. All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.)
TOTAL HARMONIC DISTORTION
vs. INPUT AMPLITUDE
(f = 10kHz, VCC = 5.5V, AV = 1V/V)
INPUT CURRENT-NOISE DENSITY
vs. FREQUENCY
MAX44260 toc19
4.5
4.0
110
3.5
3.0
2.5
2.0
105
100
95
1.5
90
1.0
85
0.5
0
4s/div
115
THD (dB)
0.5µV/div
120
MAX44260 toc20
INPUT-CURRENT NOISE DENSITY (fA/√Hz)
5.0
10
100
1000
10k
100k
80
0
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION
vs. FREQUENCY (VIN = 2VP-P)
-85
THD (dB)
-90
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
INPUT AMPLITUDE (V)
SMALL-SIGNAL TRANSIENT RESPONSE
LARGE-SIGNAL TRANSIENT RESPONSE
MAX44260 toc23
MAX44260 toc22
-80
MAX44260 toc21
0.1Hz TO 10Hz OUTPUT-VOLTAGE NOISE
INPUT
50mV/div
VCC/2
MAX44260 toc24
INPUT
1V/div
VCC/2
-95
-100
VCC = 5.5V
OUTPUT
500mV/div
VCC/2
-105
OUTPUT
50mV/div
VCC/2
-110
VCC = 3.3V
-115
-120
1
10
100
1k
10k
100k
200ns/div
100ns/div
FREQUENCY (Hz)
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MAX44260/MAX44261
1.8V、15MHz低失调、低功耗、
满摆幅I/O运算放大器
典型工作特性(续)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are at
TA = +25NC, unless otherwise noted. All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.)
STABILITY vs. CAPACITIVE LOAD
AND ISOLATION RESISTANCE
OVERSHOOT (%)
14
12
10
8
6
4
2
0
100
1k
10k
100k
100k
STABLE
MAX44260 toc27
16
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
10k
RESISTIVE LOAD (I)
18
STABILITY vs. CAPACITIVE
AND RESISTIVE LOAD
MAX44260 toc26
MAX44260 toc25
20
ISOLATION RESISTANCE (I)
PERCENT OVERSHOOT
vs. LOAD RESISTANCE (VIN = 100mVP-P)
UNSTABLE
1k
100
STABLE
10
UNSTABLE
1
0
LOAD RESISTANCE (I)
500 1000 1500 2000 2500 3000 3500 4000
100
1k
POWER-UP TIME
100k
TURN-ON TIME FROM SHUTDOWN
MAX44260 toc28
MAX44260 toc29
VCC
2V/div
SHDN
2V/div
GND
VSS
OUTPUT
500mV/div
10k
CAPACITIVE LOAD (pF)
CAPACITIVE LOAD (pF)
OUTPUT
500mV/div
VSS
GND
4ms/div
10µs/div
����������������������������������������������������������������� Maxim Integrated Products 8
MAX44260/MAX44261
1.8V、15MHz低失调、低功耗、
满摆幅I/O运算放大器
引脚配置
TOP VIEW
VDD
SHDN
OUT
6
5
4
NOT TO SCALE
+
IN+
1
VSS
IN-
+
MAX44260
6
VDD
IN+
1
2
5
SHDN
VSS
3
4
OUT
IN-
MAX44261
6
VDD
2
5
CAL
3
4
OUT
SC70
SC70
MAX44260
+
1
2
3
IN+
VSS
IN-
Thin µDFN
(Ultra-Thin LGA)
引脚说明
引脚
名称
功能
MAX44260
MAX44261
1
1
IN+
同相输入端。
2
2
VSS
负电源，通过0.1μF电容旁路至地。
3
3
IN-
反相输入端。
4
4
OUT
输出端。
—
5
CAL
低电平有效校准输入。
5
—
低电平有效关断控制。
6
6
SHDN
VDD
正电源，通过0.1μF电容旁路至地。
����������������������������������������������������������������� Maxim Integrated Products 9
MAX44260/MAX44261
1.8V、15MHz低失调、低功耗、
满摆幅I/O运算放大器
详细说明
交越失真
运算放大器内部集成低噪声电荷泵，在内部产生比VDD高
出1V的电压，用于PMOS晶体管输入差分对供电，如图1
所示。这种独特架构消除了CMOS输入架构中常见的交越
失真(图2)，特别是在同相配置时，例如Sallen-Key滤波器。
MAX44260/MAX44261为高速、低功耗运算放大器，由于
器件具有高精度、低噪声CMOS输入，非常适合信号处理
应用。器件的上电自校准功能消除了温度和电源变化的影
响。
电荷泵的工作频率远远高于放大器的单位增益带宽。高频
工作及超低噪声电路设计，有效抑制了电荷泵噪声，无需
使用外部元件，用户端完全透明。
MAX44260具有低功耗关断模式，器件不工作时可进入关
断模式，有效降低静态电流。可在30μs之内从关断模式恢
复工作。
MAX44261具有用户可选的自校准输入，任何时候均可关
断器件，允许重复校准。校准过程需要10ms。
INTERNAL
CHARGE
PUMP
MAX44260 INPUTS STRUCTURE
STANDARD INPUT STRUCTURE
图1. MAX44260输入架构与标准运放输入的比较
AMPLIFIER OUTPUT
CROSSOVER
DISTORTION
MAX44261
TIME
图2. 典型放大器的交越失真
���������������������������������������������������������������� Maxim Integrated Products 10
MAX44260/MAX44261
1.8V、15MHz低失调、低功耗、
满摆幅I/O运算放大器
应用信息
MAX44261具有一个重新校准输入控制，与MAX44260的
关断控制功能相同。但拉低输入时，器件将再次执行自校
准过程(图3)。
上电自动微调
器件具有自动微调功能，上电时将器件的输入失调电压
VOS自校准至50μV以下。通过重新上电，自校准功能可以
消除由于电源、工作温度变化产生的输入失调电压。完成
自动微调需要大约10ms，由内部上电复位(POR)电路触发
操作。在此期间，输入和输出置于高阻态，保持浮空。通
过将CAL输入拉低1μs，MAX44261还可再次强制进入自
校准。该输入也将器件置于关断模式。
器件的关断逻辑电平独立于电源电压，即使采用1.8V或
3.3V微控制器都可以控制器件进入关断模式，与电源电压
无关。
满摆幅输入/输出
IC的输入电压范围可扩展至VDD以上及VSS以下100mV，较
宽的共模输入电压范围允许运放在各种信号处理应用中用
作缓冲器和差分放大器。输出电压的上限/下限设计为高于
VSS、低于VDD 50mV，使器件在单电源应用中具有最大动
态范围。器件具有高输出电流驱动能力和大电容驱动能力，
可理想用作ADC驱动器和线驱动器。
关断工作
MAX44260具有低电平有效关断控制，关断时输入和输出
置于高阻态，静态电流降低至1μA以内。将输出置于高阻
态时，允许多路输出复用到一条输出线，无需额外的外部
缓冲器。退出关断模式时，器件不进行自校准，保持其上
电微调设置。图3所示为器件在30µs内从关断模式恢复的
过程。
VDD
VSHDN/VCAL
0V
VDD/2
FAST RECOVERY
AMPLIFIER
ACTIVE
MAX44260
OUTPUT
0V
VDD/2
MAX44261
OUTPUT
0V
AUTOTRIM
SEQUENCE
RECALIBRATED
AMPLIFIER
ACTIVE
30µs
10ms
图3. CAL与SHDN输入操作比较
���������������������������������������������������������������� Maxim Integrated Products 11
MAX44260/MAX44261
1.8V、15MHz低失调、低功耗、
满摆幅I/O运算放大器
输入偏置电流
IC采用高阻CMOS输入级和专有的ESD结构，允许在低输
入以及共模输入下提供极低的输入偏置电流。连接高电阻
传感器时，低输入偏置电流特性非常关键，非常适合在光
电二极管应用中作为互阻放大器使用，理想用于以地为参
考的医疗、工业传感器。
有源滤波器
MAX44260/MAX44261可用于构建各种有源滤波器电路，
充分利用其宽带、满摆幅输入/输出和高阻CMOS输入等优
势。典型应用电路 给出一个Sallen-Key有源滤波器的例子，
截止频率为10kHz。低频时，放大器类似于简单的低失真
同相缓冲器，较宽的频带能够在高于截止频率时提供卓越
的阻带衰减，参见典型应用电路 。
MAX11645 ADC驱动器
IC的微小尺寸和低噪声特性使其非常适合驱动空间受限应用
中的12至16位分辨率ADC。典型应用电路 中，MAX44260
放 大 器 输 出 连 接 到 低 通 滤 波 器， 驱 动MAX11645 ADC。
MAX11645是3V/5V供电、12位/10位、双通道ADC系列产品
中的一款。
MAX11645采样率高达94ksps，测量两路单端输入或一路
差分输入。ADC在最大采样率时消耗电流670μA，1ksps时
仅消耗6μA电流，关断时电流损耗0.5μA。器件采用超小尺
寸、1.9mm x 2.2mm WLP和μMAX-8封装。MAX44260/
MAX44261放 大 器 非 常 适 合 在 便 携 应 用 中 与MAX11645
ADC配合使用。
需要较高分辨率时，请参考MAX1069 (14位)和MAX1169
(16位) ADC系列。
芯片信息
定购信息
PROCESS: BiCMOS
PART
TEMP RANGE
PINPACKAGE
TOP
MARK
MAX44260AXT+
-40NC to +125NC
6 SC70
+AEB
MAX44260AYT+
-40NC to +125NC
6 Thin FDFN
(Ultra-Thin LGA)
+AY
MAX44261AXT+
-40NC to +125NC
6 SC70
+AEC
+表示无铅(Pb)/符合RoHS标准的封装。
���������������������������������������������������������������� Maxim Integrated Products 12
MAX44260/MAX44261
1.8V、15MHz低失调、低功耗、
满摆幅I/O运算放大器
封装信息
如需最近的封装外形信息和焊盘布局(占位面积)，请查询china.maxim-ic.com/packages。请注意，封装编码中的“+”、“#”或“-”仅
表示RoHS状态。封装图中可能包含不同的尾缀字符，但封装图只与封装有关，与RoHS状态无关。
封装类型
封装编码
外形编号
焊盘布局编号
6 SC70
X6SN+1
21-0077
90-0189
6引脚薄型µDFN
(超薄LGA)封装
Y61A1+1
21-0190
90-0233
���������������������������������������������������������������� Maxim Integrated Products 13
MAX44260/MAX44261
1.8V、15MHz低失调、低功耗、
满摆幅I/O运算放大器
封装信息(续)
如需最近的封装外形信息和焊盘布局(占位面积)，请查询china.maxim-ic.com/packages。请注意，封装编码中的“+”、“#”或“-”仅
表示RoHS状态。封装图中可能包含不同的尾缀字符，但封装图只与封装有关，与RoHS状态无关。
���������������������������������������������������������������� Maxim Integrated Products 14
MAX44260/MAX44261
1.8V、15MHz低失调、低功耗、
满摆幅I/O运算放大器
封装信息(续)
如需最近的封装外形信息和焊盘布局(占位面积)，请查询china.maxim-ic.com/packages。请注意，封装编码中的“+”、“#”或“-”仅
表示RoHS状态。封装图中可能包含不同的尾缀字符，但封装图只与封装有关，与RoHS状态无关。
���������������������������������������������������������������� Maxim Integrated Products 15
MAX44260/MAX44261
1.8V、15MHz低失调、低功耗、
满摆幅I/O运算放大器
修订历史
修订号
修订日期
说明
修改页
0
6/11
最初版本。
1
8/11
增加了薄型μDFN (超薄LGA)封装，更新了摆率及TOC 29。
2
10/11
删除数据资料中的未来产品信息。
3
2/12
修改了Electrical Characteristics表及上电自动微调部分。
—
1, 2, 3, 8, 9, 12
12
2, 3, 11
Maxim北京办事处
北京8328信箱 邮政编码100083
免费电话：800 810 0310
电话：010-6211 5199
传真：010-6211 5299
Maxim不对Maxim产品以外的任何电路使用负责，也不提供其专利许可。Maxim保留在任何时间、没有任何通报的前提下修改产品资料和规格的权利。电
气特性表中列出的参数值(最小值和最大值)均经过设计验证，数据资料其它章节引用的参数值供设计人员参考。
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2012 Maxim Integrated Products 16
Maxim是Maxim Integrated Products，Inc.的注册商标。
19-5873; Rev 3; 2/12
EVALUATION KIT AVAILABLE
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
General Description
The MAX44260/MAX44261 offer a unique combination of
high speed, precision, low noise, and low-voltage operation making them ideally suited for a large number of
signal processing functions such as filtering and amplification of signals in portable and industrial equipment.
The amplifiers feature an input offset of less than 50FV
and a high-gain bandwidth product of 15MHz while
maintaining a low 1.8V supply rail. The devices’ rail-torail input/outputs and low noise guarantee maximum
dynamic range in demanding applications such as 12- to
14-bit SAR ADC drivers. Unlike traditional rail-to-rail input
structures, input crossover distortion is absent due to an
optimized input stage with an ultra-quiet charge pump.
The MAX44260 includes a fast-power-on shutdown mode
for further power savings. The MAX44261 offers a unique
on-demand calibration pin where the user can invoke
self-trimming of the input offset voltage.
Features
S Low 1.8V Supply Rail Over the -40°C to +125°C
Range
1.7V Supply Rail Over the 0°C to +70°C Range
S 15MHz Unity-Gain Bandwidth
S Low 12.7nV/Hz Input Voltage-Noise Density
S Low 1.2fA/Hz Input Current-Noise Density
S
S
S
S
S
S
Low 50µV (max) VOS at +25°C
On-Demand VOS Self-Calibration (MAX44261)
500fA Low Input Bias Current
750µA Quiescent Current per Amplifier
< 1µA Supply Current in Shutdown
Small, 2mm x 2mm SC70 and 1mm x 1.5mm Thin
µDFN (MAX44260) Packages
S Low 110dB Total Harmonic Distortion
Applications
The family of parts operates from a supply range of 1.8V
to 5.5V over the -40NC to +125NC temperature range and
can operate down to 1.7V over the 0NC to +70NC temperature range. The MAX44260/MAX44261 are available
in small, 6-pin SC70 packages. The MAX44260 is also
available in a 1mm x 1.5mm thin μDFN (ultra-thin LGA)
package.
Notebooks
3G/4G Handsets
Portable Media Players
Portable Medical Instruments
Battery-Operated Devices
Analog-to-Digital Converter Buffers
Ordering Information appears at end of data sheet.
Transimpedance Amplifiers
General-Purpose Signal Processing
Typical Application Circuit
15nF
+3.3V
2.4kI
22kI
330pF
MAX44260
10kI
3.3nF
CORNER FREQUENCY = 10kHz
ADC
MAX11645
SALLEN-KEY FILTER
For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAX44260.related
_________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
ABSOLUTE MAXIMUM RATINGS
IN+, IN-, OUT .................................(VSS - 0.3V) to (VDD + 0.3V)
VDD to VSS...............................................................-0.3V to +6V
SHDN, CAL .............................................................-0.3V to +6V
Output to Short-Circuit Ground Duration .............................. 10s
Continuous Input Current into Any Pin ............................ Q20mA
Continuous Power Dissipation (TA = +70NC)
SC70 (derate 3.1mW/NC above +70NC) ......................245mW
6-Pin Thin μDFN (Ultra-Thin LGA)
(derate 2.1mW/NC above +70NC) .............................110.2mW
Operating Temperature Range ........................ -40NC to +125NC
Junction Temperature .....................................................+150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
SC70
Junction-to-Ambient Thermal Resistance (BJA) .... 326.5NC/W
Junction-to-Case Thermal Resistance (BJC) .............115NC/W
Thin μDFN (Ultra-Thin LGA)
Junction-to-Ambient Thermal Resistance (BJA) ....... 470NC/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are
at TA = +25NC, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
VDD
+ 0.1
V
DC CHARACTERISTICS
Input Voltage Range
VIN+ VIN-
Input Offset Voltage
VOS
Guaranteed by CMRR test
-0.1
10
TA = +25NC
VOS - TC
TA = +25NC
Input Bias Current
IB
Input Capacitance
Common-Mode Rejection Ratio
Open-Loop Gain
AOL
Output Short-Circuit Current
ISC
0.8
5
0.01
0.5
TA = -40NC to +85NC
10
TA = -40NC to +125NC
100
FV/NC
pA
0.4
pF
VCM = -0.1V to (VDD + 0.1V)
75
90
dB
0.4V P VOUT P VDD - 0.4V, ROUT = 10kI
100
115
0.4V P VOUT P VDD - 0.4V, ROUT = 600I
91
100
CIN
CMRR
FV
500
TA = -40C to +125C
Input Offset Voltage Drift
50
100
TA = -40C to +125C after calibration
0.4V P VOUT P VDD - 0.4V, ROUT = 32I
80
To VDD or VSS
50
dB
mA
_________________________________________________________________ Maxim Integrated Products
2
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are
at TA = +25NC, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
VOL VSS
Output Voltage Swing
VDD VOH
CONDITIONS
MIN
TYP
MAX
UNITS
20
ROUT = 10kI
50
ROUT = 600I
400
ROUT = 32I
700
10
ROUT = 10kI
mV
40
ROUT = 600I
ROUT = 32I
400
800
AC CHARACTERISTICS
Input Voltage-Noise Density
en
f = 10kHz
12.7
nV/√Hz
Input Current-Noise Density
in
f = 10kHz
1.2
fA/√Hz
GBWP
15
MHz
SR
7
V/Fs
VOUT = 2VP-P, VDD = 3.3V, AV = 1V/V,
CL = 30pF (load), settle to 0.01%
1.7
μs
No sustained oscillation
300
pF
f = 10kHz, VO = 2VP-P, AV = 1, ROUT = 10kI
-110
dB
1
μs
Gain-Bandwidth Product
Slew Rate
Settling Time
Capacitive Loading
Total Harmonic Distortion
CLOAD
THD
VOUT = 0.2V, VDD = 3.3V, AV = 1V/V;
RS = 20Ω, CL = 1nF (load)
Output Transient Recovery Time
POWER-SUPPLY CHARACTERISTICS
Power-Supply Range
Power-Supply Rejection Ratio
Quiescent Current
Shutdown Supply Current
VDD
PSRR
1.8
5.5
TA = 0NC to +70NC
1.7
5.5
VCM = VDD/2
82
IDD
ISHDN
Shutdown Input Low
VIL
Shutdown Input High
VIH
Output Leakage Current in
Shutdown
ISHDN
Shutdown Input Bias Current
IIL/IIH
Shutdown Turn-On Time
tSHDN
Turn-On Time
Guaranteed by PSRR
tON
95
750
MAX44260/MAX44261 only
dB
1200
μA
1
μA
0.7
1.3
pA
MAX44260
1
MAX44261
0.1
TA = -40C to +125C (Note 3)
TA = +25NC (Note 3)
V
V
100
TA = +25NC (Note 3)
V
14.4
18.9
26.7
9.7
TA = -40C to +125C (Note 3)
15.2
18.4
μA
μs
ms
Note 2: All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.
Note 3: Guaranteed by design.
_________________________________________________________________ Maxim Integrated Products
3
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are at
TA = +25NC, unless otherwise noted. All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.)
INPUT OFFSET VOLTAGE
vs. SUPPLY VOLTAGE
20
TA = -40°C
0
-20
TA = +25°C
0
0.5
1.0
1.5
2.0
2.5
20
TA = +25°C
0
-20
-40
TA = +125°C
-60
MAX44260 toc03
15
10
5
-100
3.5
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0
5.5
-15 -10
-5
0
5
10
15
20
SUPPLY VOLTAGE (V)
INPUT OFFSET VOLTAGE (µV)
INPUT OFFSET DRIFT HISTOGRAM
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
OUTPUT-VOLTAGE LOW
vs. OUTPUT SINK CURRENT
(VOL - VEE, VCC = 1.8V)
12
10
8
6
4
80
60
40
TA = +25°C
20
0
-20
TA = -40°C
-40
-60
2
-80
0
-100
-1.5 -1 -0.5
0
0.50 1.00
-1.8 -1.3 -0.8 -0.3 0.25 0.75 1.25
INPUT OFFSET DRIFT (µV/°C)
TA = +85°C
TA = +125°C
25
200
MAX44260 toc06
14
100
180
OUTPUT-VOLTAGE LOW (mV)
MAX44260 toc04
16
-2
20
COMMON-MODE VOLTAGE (V)
18
PERCENT OCCURRENCE (%)
3.0
INPUT BIAS CURRENT (pA)
-0.5
40
25
-80
TA = +125°C
-60
TA = -40°C
60
MAX44260 toc05
-40
80
MAX44260 toc02
40
INPUT VOS HISTOGRAM
100
INPUT OFFSET VOLTAGE (µV)
MAX44260 toc01
INPUT OFFSET VOLTAGE (µV)
60
PERCENT OCCURRENCE (%)
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
160
140
120
TA = +25°C
100
80
TA = +125°C
60
TA = -40°C
40
20
0
-0.5
0
0.5
1.0
1.5
2.0
2.5
COMMON-MODE VOLTAGE (V)
3.0
3.5
0.1
1
10
OUTPUT SINK CURRENT (mA)
100
_________________________________________________________________ Maxim Integrated Products
4
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are at
TA = +25NC, unless otherwise noted. All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.)
OUTPUT-VOLTAGE LOW
vs. OUTPUT SINK CURRENT
(VOL - VEE, VCC = 5V)
TA = +25°C
120
100
80
TA = +125°C
60
40
20
1
10
OUTPUT SINK CURRENT (mA)
140
TA = +25°C
120
100
80
TA = +125°C
60
40
20
TA = -40°C
0
0.1
140
TA = +25°C
120
100
80
TA = +125°C
60
TA = -40°C
40
20
1
10
OUTPUT SINK CURRENT (mA)
1
10
OUTPUT SOURCE CURRENT (mA)
80
100
TA = +125°C
60
TA = -40°C
40
180
160
140
100
80
TA = +125°C
60
TA = -40°C
40
0.1
1
10
OUTPUT SOURCE CURRENT (mA)
100
SUPPLY CURRENT vs. SUPPLY VOLTAGE
TA = +25°C
120
1
10
OUTPUT SOURCE CURRENT (mA)
0.1
900
MAX44260 toc11
200
850
TA = +25°C
800
TA = +125°C
750
700
TA = -40°C
650
0
0.1
100
100
20
0
TA = +25°C
120
0
0.1
OUTPUT-VOLTAGE HIGH (mV)
160
140
OUTPUT-VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
(VCC - VOH, VCC = 5V)
MAX44260 toc10
OUTPUT-VOLTAGE HIGH (mV)
180
160
20
TA = -40°C
OUTPUT-VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
(VCC - VOH, VCC = 3.3V)
200
180
0
100
MAX44260 toc09
160
200
MAX44260 toc12
140
180
SUPPLY CURRENT (µA)
160
200
MAX44260 toc08
OUTPUT-VOLTAGE LOW (mV)
180
OUTPUT-VOLTAGE LOW (mV)
MAX44260 toc07
200
OUTPUT-VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
(VCC - VOH, VCC = 1.8V)
OUTPUT-VOLTAGE HIGH (mV)
OUTPUT-VOLTAGE LOW
vs. OUTPUT SINK CURRENT
(VOL - VEE, VCC = 3.3V)
100
600
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
_________________________________________________________________ Maxim Integrated Products
5
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are at
TA = +25NC, unless otherwise noted. All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.)
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
(VSHDN = VEE)
0.6
0.5
TA = -40°C
0.4
TA = +25°C
0.3
0.2
MAX44260 toc15
100
-20
80
-40
CMRR (dB)
0.7
0
MAX44260 toc14
TA = +125°C
OPEN-LOOP GAIN (dB)
0.9
0.8
120
MAX44260 toc13
SHUTDOWN SUPPLY CURRENT (µA)
1.0
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
OPEN-LOOP GAIN
vs. FREQUENCY
60
-60
40
-80
20
-100
0.1
0
0.001 0.01
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
1
10
100
1k
10k 100k
0
1
10
100
1k
10k
FREQUENCY (kHz)
FREQUENCY (kHz)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
DC CMRR AND PSRR
vs. TEMPERATURE
INPUT VOLTAGE-NOISE DENSITY
vs. FREQUENCY
REJECTION RATIO (dB)
-40
-60
-80
DC CMRR
-94
-96
-98
-100
DC PSRR
-100
-120
0.1
1
10
100
FREQUENCY (kHz)
1k
10k
100k
MAX44260 toc18
-92
100k
500
INPUT-VOLTAGE NOISE DENSITY (nV/√Hz)
-90
MAX44260 toc16
-20
0.01
0.01
SUPPLY VOLTAGE (V)
0
PSRR (dB)
-120
0
MAX44260 toc17
1.5
450
400
350
300
250
200
150
100
50
0
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
0.01
0.1
1
10
100
1k
10k
FREQUENCY (kHz)
_________________________________________________________________ Maxim Integrated Products
6
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are at
TA = +25NC, unless otherwise noted. All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.)
TOTAL HARMONIC DISTORTION
vs. INPUT AMPLITUDE
(f = 10kHz, VCC = 5.5V, AV = 1V/V)
INPUT CURRENT-NOISE DENSITY
vs. FREQUENCY
MAX44260 toc19
4.5
4.0
110
3.5
3.0
2.5
2.0
105
100
95
1.5
90
1.0
85
0.5
0
4s/div
115
THD (dB)
0.5µV/div
120
MAX44260 toc20
INPUT-CURRENT NOISE DENSITY (fA/√Hz)
5.0
10
100
1000
10k
100k
80
0
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION
vs. FREQUENCY (VIN = 2VP-P)
-85
THD (dB)
-90
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
INPUT AMPLITUDE (V)
SMALL-SIGNAL TRANSIENT RESPONSE
LARGE-SIGNAL TRANSIENT RESPONSE
MAX44260 toc23
MAX44260 toc22
-80
MAX44260 toc21
0.1Hz TO 10Hz OUTPUT-VOLTAGE NOISE
INPUT
50mV/div
VCC/2
MAX44260 toc24
INPUT
1V/div
VCC/2
-95
-100
VCC = 5.5V
OUTPUT
500mV/div
VCC/2
-105
OUTPUT
50mV/div
VCC/2
-110
VCC = 3.3V
-115
-120
1
10
100
1k
10k
100k
200ns/div
100ns/div
FREQUENCY (Hz)
_________________________________________________________________ Maxim Integrated Products
7
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are at
TA = +25NC, unless otherwise noted. All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.)
STABILITY vs. CAPACITIVE LOAD
AND ISOLATION RESISTANCE
OVERSHOOT (%)
14
12
10
8
6
4
2
0
100
1k
10k
100k
100k
STABLE
MAX44260 toc27
16
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
10k
RESISTIVE LOAD (I)
18
STABILITY vs. CAPACITIVE
AND RESISTIVE LOAD
MAX44260 toc26
MAX44260 toc25
20
ISOLATION RESISTANCE (I)
PERCENT OVERSHOOT
vs. LOAD RESISTANCE (VIN = 100mVP-P)
1k
UNSTABLE
100
STABLE
10
UNSTABLE
1
0
LOAD RESISTANCE (I)
500 1000 1500 2000 2500 3000 3500 4000
100
1k
POWER-UP TIME
100k
TURN-ON TIME FROM SHUTDOWN
MAX44260 toc28
MAX44260 toc29
VCC
2V/div
SHDN
2V/div
GND
VSS
OUTPUT
500mV/div
10k
CAPACITIVE LOAD (pF)
CAPACITIVE LOAD (pF)
OUTPUT
500mV/div
VSS
GND
4ms/div
10µs/div
_________________________________________________________________ Maxim Integrated Products
8
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Pin Configurations
TOP VIEW
VDD
SHDN
OUT
6
5
4
NOT TO SCALE
+
IN+
1
VSS
IN-
+
MAX44260
6
VDD
IN+
1
2
5
SHDN
VSS
3
4
OUT
IN-
MAX44261
6
VDD
2
5
CAL
3
4
OUT
SC70
SC70
MAX44260
+
1
2
3
IN+
VSS
IN-
Thin µDFN
(Ultra-Thin LGA)
Pin Description
PIN
NAME
FUNCTION
MAX44260
MAX44261
1
1
IN+
2
2
VSS
Negative Power Supply. Bypass with a 0.1FF capacitor to ground.
3
3
IN-
Negative Input
Positive Input
4
4
OUT
Output
—
5
CAL
Active-Low Calibrate Input
5
—
6
6
SHDN
VDD
Active-Low Shutdown
Positive Power Supply. Bypass with a 0.1FF capacitor to ground.
_________________________________________________________________ Maxim Integrated Products
9
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Detailed Description
Crossover Distortion
These op amps feature a low-noise integrated charge
pump that creates an internal voltage rail 1V above
VDD, which is used to power the input differential
pair of PMOS transistors as shown in Figure 1. Such
a unique architecture eliminates crossover distortion common in traditional CMOS input architecture
(Figure 2), especially when used in a noninverting
configuration, such as for Sallen-Key filters.
The MAX44260/MAX44261 are high-speed low-power op
amps ideal for signal processing applications due to the
device’s high precision and low-noise CMOS inputs. The
devices self-calibrate on power-up to eliminate effects of
temperature and power-supply variation.
The MAX44260 also features a low-power shutdown
mode that greatly reduces quiescent current while the
device is not operational and recovers in 30μs.
The charge pump’s operating frequency lies well above
the unity-gain frequency of the amplifier. Thanks to its highfrequency operation and ultra-quiet circuitry, the charge
pump generates little noise, does not require external
components, and is entirely transparent to the user.
The MAX44261 features a user-selectable self-calibration
input that shuts down the device and allows it to be recalibrated at any time. The calibration routine takes 10ms.
INTERNAL
CHARGE
PUMP
MAX44260 INPUTS STRUCTURE
STANDARD INPUT STRUCTURE
Figure 1. Comparing the Input Structure of the MAX44260 to Standard Op-Amp Inputs
AMPLIFIER OUTPUT
CROSSOVER
DISTORTION
MAX44261
TIME
Figure 2. Crossover Distortion of Typical Amplifiers
________________________________________________________________ Maxim Integrated Products 10
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Applications Information
and retains its power-up trim settings. Figure 3 shows
that the device also recovers from shutdown in under
30Fs.
Power-Up Autotrim
The MAX44261 features a recalibrate input that acts the
same as the shutdown mode of the MAX44260. However,
when the input is pulled low, the device goes through a
self-calibration sequence again (Figure 3).
The ICs feature an automatic trim that self-calibrates the
VOS of these devices to less than 50FV of input offset
voltage on power-up. This self-calibration feature allows
the device to eliminate input offset voltage effects due
to power supply and operating temperature variation
simply by cycling its power. The autotrim sequence takes
approximately 10ms to complete and is triggered by an
internal power-on-reset (POR) circuitry. During this time,
the inputs and outputs are put into high impedance and
left unconnected. The MAX44261 can also be forced into
a self-calibration cycle by pulling the CAL input low for
1μs. This input also puts the part into shutdown mode.
The shutdown logic levels of the devices are independent of supply, allowing the shutdown feature of the
device to operate off of a 1.8V or 3.3V microcontroller,
regardless of supply voltage.
Rail-to-Rail Input/Output
The input voltage range of the ICs extends 100mV
above VDD and below VSS. The wide input commonmode voltage range allows the op amp to be used as
a buffer and as a differential amplifier in a wide-variety
of signal processing applications. Output voltage high/
low is designed to be only 50mV above VSS and below
VDD allowing maximum dynamic range in single-supply
applications. The high output current and capacitance
drive capability of the devices make them ideal as an
ADC driver and a line driver.
Shutdown Operation
The MAX44260 features an active-low shutdown mode
that puts both inputs and outputs into high impedance
and substantially lowers the quiescent current to less
than 1FA. Putting the output into high impedance allows
multiple outputs to be multiplexed onto a single output
line without the additional external buffers. The device
does not self-calibrate when exiting shutdown mode
VDD
VSHDN/VCAL
0V
VDD/2
FAST RECOVERY
AMPLIFIER
ACTIVE
MAX44260
OUTPUT
0V
VDD/2
MAX44261
OUTPUT
0V
AUTOTRIM
SEQUENCE
RECALIBRATED
AMPLIFIER
ACTIVE
30µs
10ms
Figure 3. CAL vs. SHDN Input Operation.
________________________________________________________________ Maxim Integrated Products 11
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Input Bias Current
The ICs feature a high-impedance CMOS input stage
and a specialized ESD structure that allows low-input
bias current operation at low-input, common-mode voltages. Low-input bias current is useful when interfacing
with high-ohmic sensors. It is also beneficial for designing transimpedance amplifiers for photodiode sensors.
This makes these devices ideal for ground-referenced
medical and industrial sensor applications.
Active Filters
The MAX44260/MAX44261 are ideal for a wide variety
of active filter circuits that make use of their wide bandwidth, rail-to-rail input/output stages and high-impedance
CMOS inputs. The Typical Application Circuit shows an
example Sallen-Key active filter circuit with a corner
frequency of 10kHz. At low frequencies, the amplifier
behaves like a simple low-distortion noninverting buffer, while its high bandwidth gives excellent stopband
attenuation above its corner frequency. See the Typical
Application Circuit.
Driver for Interfacing with
the MAX11645 ADC
The ICs’ tiny size and low noise makes them a good fit for
driving 12- to 16-bit resolution ADCs in space-constrained
applications. The Typical Application Circuit shows the
MAX44260 amplifier output connected to a lowpass filter
driving the MAX11645 ADC. The MAX11645 is part of a
family of 3V and 5V, 12-bit and 10-bit, 2-channel ADCs.
The MAX11645 offers sample rates up to 94ksps and
measures two single-ended inputs or one differential
input. These ADCs dissipate 670FA at the maximum
sampling rate, but just 6FA at 1ksps and 0.5FA in shutdown. Offered in the ultra-tiny, 1.9mm x 2.2mm WLP and
FMAX-8 packages, the MAX11645 ADCs are an ideal fit
to pair with the MAX44260/MAX44261 amplifiers in portable applications.
Where higher resolution is required, refer to the MAX1069
(14-bit) and MAX1169 (16-bit) ADC families.
Chip Information
Ordering Information
PROCESS: BiCMOS
PINPACKAGE
TOP
MARK
-40NC to +125NC
6 SC70
+AEB
MAX44260AYT+
-40NC to +125NC
6 Thin FDFN
(Ultra-Thin LGA)
+AY
MAX44261AXT+
-40NC to +125NC
6 SC70
+AEC
PART
TEMP RANGE
MAX44260AXT+
+Denotes a lead(Pb)-free/RoHS-compliant package.
________________________________________________________________ Maxim Integrated Products 12
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Package Information
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or
“-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains
to the package regardless of RoHS status.
PACKAGE TYPE
PACKAGE CODE
OUTLINE NO.
LAND PATTERN NO.
6 SC70
X6SN+1
21-0077
90-0189
6 Thin FDFN
(Ultra-Thin LGA)
Y61A1+1
21-0190
90-0233
________________________________________________________________ Maxim Integrated Products 13
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or
“-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains
to the package regardless of RoHS status.
________________________________________________________________ Maxim Integrated Products 14
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or
“-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains
to the package regardless of RoHS status.
________________________________________________________________ Maxim Integrated Products 15
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Revision History
REVISION
NUMBER
REVISION
DATE
0
6/11
Initial release
1
8/11
Added thin μDFN (ultra-thin LGA) package and updated slew rate and TOC 29
2
10/11
Removed future product information from data sheet
3
2/12
Revised Electrical Characteristics and the Power-Up Autotrim section.
DESCRIPTION
PAGES
CHANGED
—
1, 2, 3, 8, 9, 12
12
2, 3, 11
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical
Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
©
2012 Maxim Integrated Products
16
Maxim is a registered trademark of Maxim Integrated Products, Inc.