Analog Devices Inc. LT1789CS8-10#PBF

Overview

LT1789CS8-10#PBF from Analog Devices (formerly Linear Technology) is a precision micropower instrumentation amplifier optimized for single-supply operation from 2.2V to 36V, featuring 95μA max supply current, 10–1000 programmable gain via single external resistor RG, and rail-to-rail output swing within 110mV of ground - used in low-power bridge sensor signal conditioning for industrial process monitoring.

For engineers reviewing the LT1789CS8-10#PBF datasheet, LT1789CS8-10#PBF pinout, LT1789CS8-10#PBF application, or LT1789CS8-10#PBF equivalent, key selection criteria include guaranteed 0.25% max gain error at G=10, 40ppm max nonlinearity, ±40nA input bias current, and 8-pin SO package compatibility with space-constrained portable instrumentation designs.

Technical Context

The LT1789CS8-10#PBF implements a three-op-amp instrumentation architecture with laser-trimmed thin-film resistors, enabling high CMRR (96dB min at G=10) and PSRR (100dB min at G=10) over temperature. Its input stage operates down to the negative rail (V–), supporting true single-supply common-mode range to ground.

Gain is set exclusively by external resistor RG across pins 1 and 8, with G = 10 × (1 + 200kΩ/RG). The device maintains stable operation driving capacitive loads up to 1000pF and features ESD protection rated to 10kV HBM on all inputs.

Key Specifications

Pinout & Package

LT1789CS8-10#PBF is housed in an 8-lead plastic SO (Small Outline) package, measuring 4.9mm × 3.9mm × 1.45mm, compatible with standard SO-8 reflow profiles and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar instrumentation amplifier applications.

Compared with AD8421ARMZ and INA333AIDR, the LT1789CS8-10#PBF uniquely balances ultra-low power (95μA), guaranteed 0.25% gain accuracy at G=10, and true single-supply rail-to-rail output - making it optimal for precision, battery-operated industrial sensors where calibration overhead and layout area are critical constraints.

Availability

LT1789CS8-10#PBF is available at Aetrix Electronics and suitable for industrial process control, portable test equipment, and medical diagnostics requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for LT1789CS8-10#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The LT1789 family was designed by Linear Technology (acquired by ADI in 2017) specifically for precision, low-power sensor signal conditioning in space- and energy-constrained applications - emphasizing laser-trimmed accuracy, single-supply usability, and robust ESD tolerance.

FAQ

What is the minimum supply voltage for reliable operation of the LT1789CS8-10#PBF?

The LT1789CS8-10#PBF operates reliably down to 2.2V total supply voltage, verified across –40°C to +85°C. At 2.2V, it maintains 95μA max supply current and retains full functionality including rail-to-rail output swing and 10–1000 gain range - enabling direct integration into 2.4V Li-ion battery systems before regulation.

How does the LT1789CS8-10#PBF achieve its 0.25% max gain error at G=10?

The LT1789CS8-10#PBF achieves 0.25% max gain error at G=10 through laser trimming of internal thin-film resistors during wafer sort, combined with a highly symmetric three-op-amp topology that minimizes mismatch-induced errors. This specification is guaranteed over temperature and supply voltage variations, and applies specifically to the LT1789CS8-10#PBF variant - not the LT1789CS8-1#PBF.

Can the LT1789CS8-10#PBF drive a 1000pF capacitive load without oscillation?

Yes, the LT1789CS8-10#PBF is explicitly characterized to drive up to 1000pF capacitive loads stably in any gain configuration, as confirmed in the datasheet's "Overshoot vs Capacitive Load" curves (Figure 1789 G28). This eliminates the need for external isolation resistors when interfacing with anti-aliasing filters or long PCB traces in high-EMI environments.

What is the function of the REF pin on the LT1789CS8-10#PBF?

The REF pin on the LT1789CS8-10#PBF sets the output common-mode voltage. When tied to a stable reference (e.g., mid-supply or ADC reference), it defines the DC level around which the amplified differential signal swings. It has 220kΩ input resistance and draws only 2.7μA, allowing direct connection to precision voltage dividers or buffered references without loading error.

Is the LT1789CS8-10#PBF pin-compatible with the LT1789CS8-1#PBF?

No, the LT1789CS8-10#PBF and LT1789CS8-1#PBF share identical pinout and package but differ in internal gain scaling: the LT1789CS8-10#PBF uses G = 10 × (1 + 200kΩ/RG), while the LT1789CS8-1#PBF uses G = 1 + 200kΩ/RG. Substituting one for the other without adjusting RG will result in incorrect gain - e.g., RG = 200kΩ yields G=2 on LT1789CS8-1#PBF but G=20 on LT1789CS8-10#PBF.