Datasheet LT1638, LT1639 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 1.2MHz, 0.4V/µs Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps |
| Pages / Page | 18 / 1 — FEATURES. DESCRIPTION. Operates with Inputs Above V +. Rail-to-Rail Input … |
| File Format / Size | PDF / 263 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. Operates with Inputs Above V +. Rail-to-Rail Input and Output. Low Power: 230μA per Amplifi er Max
Model Line for this Datasheet
Text Version of Document
LT1638/LT1639 1.2MHz, 0.4V/µs Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps
FEATURES DESCRIPTION
n
Operates with Inputs Above V +
The LT®1638 is a low p wer dual rail-to-rail input and output n
Rail-to-Rail Input and Output
operational amplifi er available in the standard 8-pin PDIP n
Low Power: 230μA per Amplifi er Max
and SO packages as well as the 8-lead MSOP package. The n Gain Bandwidth Product: 1.2MHz LT1639 is a low power quad rail-to-rail input and output n Slew Rate: 0.4V/μs operational amplifi er offered in the standard 14-pin PDIP n High Output Current: 25mA Min and surface mount packages. For space limited applications n Specifi ed on 3V, 5V and ±15V Supplies the LT1638 is available in a 3mm x 3mm x 0.8mm dual n Reverse Battery Protection to 18V fi ne pitch leadless package (DFN). n No Supply Sequencing Problems The LT1638/LT1639 op amps operate on all single and split n High Voltage Gain: 1500V/mV supplies with a total voltage of 2.5V to 44V drawing only n Single Supply Input Range: –0.4V to 44V 170μA of quiescent current per amplifi er. These ampli- n High CMRR: 98dB fi ers are reverse battery protected and draw no current n No Phase Reversal for reverse supply up to 18V. n Available in 14-Lead SO, 8-Lead MSOP and DFN The input range of the LT1638/LT1639 includes both sup- Packages plies, and a unique feature of this device is its capability to operate over the top with either or both of its inputs
APPLICATIONS
above V+. The inputs handle 44V, both differential and common mode, independent of supply voltage. The input n Battery- or Solar-Powered Systems stage incorporates phase reversal protection to prevent Portable Instrumentation false outputs from occurring when the inputs are below Sensor Conditioning the negative supply. Protective resistors are included in n Supply Current Sensing the input leads so that current does not become excessive n Battery Monitoring when the inputs are forced below the negative supply. n Micropower Active Filters The LT1638/LT1639 can drive loads up to 25mA and still n 4mA to 20mA Transmitters maintain rail-to-rail capability. The op amps are unity-gain L, LT, LTC, LTM, Over-The-Top, Linear Technology and the Linear logo are registered stable and drive all capacitive loads up to 1000pF when trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. optional output compensation is used.
TYPICAL APPLICATION Output Voltage vs Input Voltage Over-The-Top® Comparator with 100mV Hysteresis Centered at 0mV
5V V 10k CC 1M V1 VCC VCC 1M + + A B V0 1/2 LT1638 1/2 LT1638 – 1M – 0V 10k 1M V2 1638/39 TA01 V 1638/39 TA02 CC = 5V, VCM = 0V TO 44V, tPD = 27μs 20mV/DIV 16389fg 1
FEATURES DESCRIPTION
n
Operates with Inputs Above V +
The LT®1638 is a low p wer dual rail-to-rail input and output n
Rail-to-Rail Input and Output
operational amplifi er available in the standard 8-pin PDIP n
Low Power: 230μA per Amplifi er Max
and SO packages as well as the 8-lead MSOP package. The n Gain Bandwidth Product: 1.2MHz LT1639 is a low power quad rail-to-rail input and output n Slew Rate: 0.4V/μs operational amplifi er offered in the standard 14-pin PDIP n High Output Current: 25mA Min and surface mount packages. For space limited applications n Specifi ed on 3V, 5V and ±15V Supplies the LT1638 is available in a 3mm x 3mm x 0.8mm dual n Reverse Battery Protection to 18V fi ne pitch leadless package (DFN). n No Supply Sequencing Problems The LT1638/LT1639 op amps operate on all single and split n High Voltage Gain: 1500V/mV supplies with a total voltage of 2.5V to 44V drawing only n Single Supply Input Range: –0.4V to 44V 170μA of quiescent current per amplifi er. These ampli- n High CMRR: 98dB fi ers are reverse battery protected and draw no current n No Phase Reversal for reverse supply up to 18V. n Available in 14-Lead SO, 8-Lead MSOP and DFN The input range of the LT1638/LT1639 includes both sup- Packages plies, and a unique feature of this device is its capability to operate over the top with either or both of its inputs
APPLICATIONS
above V+. The inputs handle 44V, both differential and common mode, independent of supply voltage. The input n Battery- or Solar-Powered Systems stage incorporates phase reversal protection to prevent Portable Instrumentation false outputs from occurring when the inputs are below Sensor Conditioning the negative supply. Protective resistors are included in n Supply Current Sensing the input leads so that current does not become excessive n Battery Monitoring when the inputs are forced below the negative supply. n Micropower Active Filters The LT1638/LT1639 can drive loads up to 25mA and still n 4mA to 20mA Transmitters maintain rail-to-rail capability. The op amps are unity-gain L, LT, LTC, LTM, Over-The-Top, Linear Technology and the Linear logo are registered stable and drive all capacitive loads up to 1000pF when trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. optional output compensation is used.
TYPICAL APPLICATION Output Voltage vs Input Voltage Over-The-Top® Comparator with 100mV Hysteresis Centered at 0mV
5V V 10k CC 1M V1 VCC VCC 1M + + A B V0 1/2 LT1638 1/2 LT1638 – 1M – 0V 10k 1M V2 1638/39 TA01 V 1638/39 TA02 CC = 5V, VCM = 0V TO 44V, tPD = 27μs 20mV/DIV 16389fg 1
