LT1638 - 1.2MHz, 0.4V/μs Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps
Features
- Operates with Inputs Above V+
- Rail-to-Rail Input and Output
- Low Power: 230μA per Amplifier Max
- Gain Bandwidth Product: 1.2MHz
- Slew Rate: 0.4V/μs
- High Output Current: 25mA Min
- Specified on 3V, 5V and ±15V Supplies
- Reverse Battery Protection to 18V
- No Supply Sequencing Problems
- High Voltage Gain: 1500V/mV
- Single Supply Input Range: –0.4V to 44V
- High CMRR: 98dB
- No Phase Reversal
- Available in 14-Lead SO, 8-Lead MSOP and DFN Packages
Typical Application
Description
The LT®1638 is a low power dual rail-to-rail input and output operational amplifier available in the standard 8-pin PDIP and SO packages as well as the 8-lead MSOP package. The LT1639 is a low power quad rail-to-rail input and output operational amplifier offered in the standard 14-pin PDIP and surface mount packages. For space limited applications the LT1638 is available in a 3mm x 3mm x 0.8mm dual fine pitch leadless package (DFN).
The LT1638/LT1639 op amps operate on all single and split supplies with a total voltage of 2.5V to 44V drawing only 170μA of quiescent current per amplifier. These amplifiers are reverse battery protected and draw no current for reverse supply up to 18V.
The input range of the LT1638/LT1639 includes both supplies, and a unique feature of this device is its capability to operate over the top with either or both of its inputs above V+. The inputs handle 44V, both differential and common mode, independent of supply voltage. The input stage incorporates phase reversal protection to prevent false outputs from occurring when the inputs are below the negative supply. Protective resistors are included in the input leads so that current does not become excessive when the inputs are forced below the negative supply. The LT1638/LT1639 can drive loads up to 25mA and still maintain rail-to-rail capability. The op amps are unity-gain stable and drive all capacitive loads up to 1000pF when optional output compensation is used.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LT1638CDD#PBF | 3x3 DFN-8 | DD | C | 05-08-1698 | Yes |
| LT1638CDD#TRPBF | 3x3 DFN-8 | DD | C | 05-08-1698 | Yes |
| LT1638CMS8#PBF | MS-8 | MS8 | C | 05-08-1660 | Yes |
| LT1638CMS8#TRPBF | MS-8 | MS8 | C | 05-08-1660 | Yes |
| LT1638CN8#PBF | N-8 | N | C | 05-08-1510 (N8) | Yes |
| LT1638CS8#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1638CS8#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1638HS8#PBF | SO-8 | S8 | H | 05-08-1610 (S8) | Yes |
| LT1638HS8#TRPBF | SO-8 | S8 | H | 05-08-1610 (S8) | Yes |
| LT1638IDD#PBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LT1638IDD#TRPBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LT1638IMS8#PBF | MS-8 | MS8 | I | 05-08-1660 | Yes |
| LT1638IMS8#TRPBF | MS-8 | MS8 | I | 05-08-1660 | Yes |
| LT1638IN8#PBF | N-8 | N | I | 05-08-1510 (N8) | Yes |
| LT1638IS8#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LT1638IS8#TRPBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT1638CDD#PBF | 3x3 DFN-8 | C | $3.39 | $2.40 | Yes | |
| LT1638CDD#TRPBF | 3x3 DFN-8 | C | $2.45 | Yes | ||
| LT1638CMS8#PBF | MS-8 | C | $3.00 | $2.30 | Yes | |
| LT1638CMS8#TRPBF | MS-8 | C | $2.36 | Yes | ||
| LT1638CN8#PBF | N-8 | C | $2.50 | $1.95 | Yes | |
| LT1638CS8#PBF | SO-8 | C | $2.60 | $2.05 | Yes | |
| LT1638CS8#TRPBF | SO-8 | C | $2.11 | Yes | ||
| LT1638HS8#PBF | SO-8 | H | $3.05 | $2.65 | Yes | |
| LT1638HS8#TRPBF | SO-8 | H | $2.71 | Yes | ||
| LT1638IDD#PBF | 3x3 DFN-8 | I | $4.07 | $2.88 | Yes | |
| LT1638IDD#TRPBF | 3x3 DFN-8 | I | $2.93 | Yes | ||
| LT1638IMS8#PBF | MS-8 | I | $3.65 | $2.55 | Yes | |
| LT1638IMS8#TRPBF | MS-8 | I | $2.61 | Yes | ||
| LT1638IN8#PBF | N-8 | I | $2.85 | $2.40 | Yes | |
| LT1638IS8#PBF | SO-8 | I | $2.95 | $2.55 | Yes | |
| LT1638IS8#TRPBF | SO-8 | I | $2.61 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC594A | LT1638CDD | Dual, Over-The-Top, Micropower, Rail-to-Rail Input and Output Op Amp in DFN Package | $50.00 | |
| Buy Now | |||
Applications
- Battery- or Solar-Powered Systems
Portable Instrumentation
Sensor Conditioning - Supply Current Sensing
- Battery Monitoring
- Micropower Active Filters
- 4mA to 20mA Transmitters
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LT1638
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
