DocumentationDatasheet
Reliability Data
LT Journal
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Features
- Pin Selectable Gain of 1 or 10
- High Common Mode Voltage Range:
85V Window (VS = 5V, 0V)
±250V (VS = ±15V) - Common Mode Rejection Ratio: 70dB Min
- Input Protection to ±350V
- Gain Error: 0.28% Max
- PSRR: 82dB Min
- High Input Impedance: 2MΩ Differential, 500kΩ Common Mode
- Micropower: 120µA Max Supply Current
- Wide Supply Range: 2.7V to 36V
- –3dB Bandwidth: 100kHz
- Rail-to-Rail Output
- 8-Pin SO Package
Typical Application
Description
The LT1990 is a micropower precision difference amplifier with a very high common mode input voltage range. It has pin selectable gains of 1 or 10. The LT1990 operates over a ±250V common mode voltage range on a ±15V supply. The inputs are fault protected from common mode voltage transients up to ±350V and differential voltages up to ±500V. The LT1990 is ideally suited for both high side and low side current or voltage monitoring.
On a single 5V supply, the LT1990 has an adjustable 85V input range, 70dB min CMRR and draws less than 120µA supply current. The rail-to-rail output maximizes the dynamic range, especially important for single supplies as low as 2.7V.
The LT1990 is specified for single 3V, 5V and ±15V supplies over both commercial and industrial temperature ranges. The LT1990 is available in the 8-pin SO package.
SO-8
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LT1990ACS8#PBF | SO | 8 | C | $2.35 | $1.95 |
| LT1990ACS8#TRPBF | SO | 8 | C | $2.01 | |
| LT1990AHS8#PBF | SO | 8 | H | $2.82 | $2.34 |
| LT1990AHS8#TRPBF | SO | 8 | H | $2.40 | |
| LT1990AIS8#PBF | SO | 8 | I | $2.82 | $2.34 |
| LT1990AIS8#TRPBF | SO | 8 | I | $2.40 | |
| LT1990CS8#PBF | SO | 8 | C | $1.65 | $1.35 |
| LT1990CS8#TRPBF | SO | 8 | C | $1.41 | |
| LT1990HS8#PBF | SO | 8 | H | $1.95 | $1.62 |
| LT1990HS8#TRPBF | SO | 8 | H | $1.68 | |
| LT1990IS8#PBF | SO | 8 | I | $1.95 | $1.62 |
| LT1990IS8#TRPBF | SO | 8 | I | $1.68 | |
| LT1990ACS8 | SO | 8 | C | $4.70 | $3.90 |
| LT1990ACS8#TR | SO | 8 | C | $4.02 | |
| LT1990AIS8 | SO | 8 | I | $5.64 | $4.68 |
| LT1990AIS8#TR | SO | 8 | I | $4.80 | |
| LT1990CS8 | SO | 8 | C | $3.30 | $2.70 |
| LT1990CS8#TR | SO | 8 | C | $2.82 | |
| LT1990IS8 | SO | 8 | I | $3.90 | $3.24 |
| LT1990IS8#TR | SO | 8 | I | $3.36 | |
| LT1990AHS8 | SO | 8 | H | $5.64 | $4.68 |
| LT1990HS8 | SO | 8 | H | $3.90 | $3.24 |
| LT1990AHS8#TR | SO | 8 | H | $4.80 | |
| LT1990HS8#TR | SO | 8 | H | $3.36 |
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 |
|---|---|---|---|
| DC819A | LT1990CS8/LT1991CMS/LT1995CMS | Configurable Gain Amplifiers, V+ = +2.5V to +15V, V- = -2.5V to -15V | $75.00 |