Analog Devices Inc. ADN8835ACPZ-R7

Overview

ADN8835ACPZ-R7 from Analog Devices is an ultracompact, monolithic thermoelectric cooler (TEC) controller with integrated linear and PWM power stages, 3 A output capability, 2.0 MHz switching frequency, and dual zero-drift chopper amplifiers for analog PID compensation - used in laser diode temperature stabilization within optical transceivers.

For engineers reviewing the ADN8835ACPZ-R7 datasheet, ADN8835ACPZ-R7 pinout, ADN8835ACPZ-R7 application, or ADN8835ACPZ-R7 equivalent, key selection criteria include TEC voltage/current monitoring accuracy (±15% at 1–3 A), independent heating/cooling current limits, 2.50 V ±1% reference, thermal lock indication, and LFCSP-36 package compatibility with high-density optical module layouts.

Technical Context

The ADN8835ACPZ-R7 implements a hybrid H-bridge architecture: one side uses a 2.0 MHz PWM driver with external LC filter (1 µH + 10 µF), the other employs a linear output (LDR) - enabling >90% efficiency while eliminating second inductor. Its two rail-to-rail chopper amplifiers serve as error amplifier (IN1P/IN1N → OUT1) and PID compensation amplifier (IN2P/IN2N → OUT2), both with <100 µV offset and 2 MHz GBW.

Temperature setpoint is applied as analog voltage (e.g., DAC or resistor divider), while feedback comes from NTC thermistors or RTDs. The internal 2.50 V reference biases sensor bridges and programs TEC voltage/current limits via VLIM/SD and ILIM pins - supporting asymmetric heating/cooling thresholds and autonomous analog loop control without microcontroller intervention.

Key Specifications

Pinout & Package

ADN8835ACPZ-R7 is housed in a 36-lead, 6 mm × 6 mm lead-frame chip-scale package (LFCSP-CP-36-5) with exposed thermal pad (EPAD) soldered to analog ground. Pin functions are validated per Analog Devices Rev. B datasheet Figure 4 and Table 5.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TEC controller applications.

Compared with ADN8834ACPZ-R7 and MAX1968EUB+, the ADN8835ACPZ-R7 delivers superior thermal stability via integrated chopper amplifiers, eliminates external sensing, and enables compact, high-efficiency optical module designs through its hybrid linear-PWM architecture - making it the preferred choice for 100G+ coherent and pluggable transceiver applications.

Availability

ADN8835ACPZ-R7 is available at Aetrix Electronics and suitable for optical transceivers, laser diode modules, fiber test equipment, and biomedical laser systems requiring stable component supply, traceable lot history, and long-term lifecycle support.

Supply support for ADN8835ACPZ-R7 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. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The ADN8835ACPZ-R7 belongs to Analog Devices' TEC controller product line, engineered specifically for high-stability, low-noise temperature regulation in optical communication and photonics applications - emphasizing integration, efficiency, and autonomous analog loop operation.

FAQ

What is the maximum TEC voltage limit supported by the ADN8835ACPZ-R7?

The ADN8835ACPZ-R7 supports programmable TEC voltage limits via the VLIM/SD pin, with cooling and heating thresholds independently adjustable. At VPVIN = 5.5 V, the maximum TEC voltage is limited to approximately 5.3 V (97% of VPVIN) due to internal driver headroom. The device guarantees accurate limit enforcement down to 0.07 V shutdown threshold, and the 2.0 MHz PWM architecture maintains <1% output ripple under full 3 A load with standard 1 µH/10 µF filtering - critical for low-noise laser biasing in ADN8835ACPZ-R7-based designs.

Does the ADN8835ACPZ-R7 require an external sense resistor for current monitoring?

No, the ADN8835ACPZ-R7 does not require an external sense resistor. It integrates precision current sensing with a nominal gain of 0.285 V/A (RCS), delivering ITEC output voltage proportional to TEC current with ±15% accuracy across 1–3 A. This eliminates PCB area, cost, and thermal drift associated with discrete shunts - a key differentiator confirmed in the Rev. B datasheet Table 2 and Theory of Operation section. All ADN8835ACPZ-R7 current-limit and readback functions rely solely on this internal sensing path.

How does the ADN8835ACPZ-R7 achieve thermal stability better than conventional TEC controllers?

The ADN8835ACPZ-R7 achieves superior thermal stability through two integrated zero-drift chopper amplifiers - each with <100 µV input offset, 120 dB CMRR, and 2 MHz GBW - used as error and PID compensation amplifiers. These eliminate 1/f noise and long-term drift, enabling autonomous analog loop control without microcontroller intervention. Real-world testing shows <0.1°C thermal error over 200 s at constant ambient (Figure 11–12), directly attributable to chopper architecture - a capability not found in non-chopper TEC drivers like MAX1968EUB+ or ADN8834ACPZ-R7.

Can the ADN8835ACPZ-R7 operate with both NTC thermistors and RTD sensors?

Yes, the ADN8835ACPZ-R7 is explicitly designed to interface with both negative temperature coefficient (NTC) thermistors and positive temperature coefficient resistive temperature detectors (RTDs), as stated in the General Description and Applications sections of the Rev. B datasheet. Its first chopper amplifier (IN1P/IN1N → OUT1) conditions thermistor bridge outputs or RTD voltage dividers into a linear temperature-proportional signal. The 2.50 V reference provides stable excitation, and the amplifier's rail-to-rail input/output range (0 V to VVDD) accommodates full-scale sensor spans - verified across −40°C to +125°C operating range for ADN8835ACPZ-R7.

What package type and thermal performance does the ADN8835ACPZ-R7 use?

The ADN8835ACPZ-R7 uses a 36-lead, 6 mm × 6 mm LFCSP (CP-36-5) package with exposed thermal pad (EPAD), as specified in Table 1 and Pin Configuration section of the Rev. B datasheet. With EPAD soldered to a solid analog ground plane, it achieves θJA = 33°C/W (JEDEC 4-layer board). Thermal shutdown activates at 170°C with 17°C hysteresis, and the package supports >90% efficiency at 3 A - enabling compact, fanless optical module designs. No alternate packages exist for ADN8835ACPZ-R7; this LFCSP variant is the only production offering.