Analog Devices Inc. AD876JR-8

Overview

AD876JR-8 from Analog Devices is a CMOS 10-bit, 20 MSPS analog-to-digital converter with single +5 V supply operation, 160 mW power dissipation, and guaranteed no missing codes over 0°C to +70°C. It features differential nonlinearity of ±0.5 LSB, on-chip sample-and-hold, and straight-binary digital outputs - deployed in CCD-based color scanners and digital copiers requiring high-speed digitization of 3.58 MHz video signals.

For engineers reviewing the AD876JR-8 datasheet, AD876JR-8 pinout, AD876JR-8 application, or AD876JR-8 equivalent, this page delivers verified technical context for video ADC selection, including FFT performance at 3.58 MHz (SINAD = 49 dB), force-sense reference interface implementation, and SOIC-28 package–specific pin validation.

Technical Context

The AD876JR-8 implements a multistage pipelined architecture with output error correction logic to achieve 10-bit accuracy at 20 MSPS while guaranteeing no missing codes across temperature. Its input stage integrates a sample-and-hold amplifier with aperture jitter of 22 ps and full-power bandwidth of 150 MHz.

Reference handling uses force-sense topology (REFTF/REFTS and REFBF/REFBS) to null voltage drops across internal 250 Ω ladder resistance; analog input range is programmable from 2 V p-p by adjusting top/bottom reference voltages between 1.6 V–4.5 V and 3.5 V–4.5 V respectively.

Key Specifications

Pinout & Package

AD876JR-8 is packaged in a 28-lead SOIC (R-28) with exposed pad not present; footprint compatible with JEDEC MS-012AC. Pin functions are validated per Analog Devices Rev. B datasheet Figure 1 and PIN CONFIGURATIONS table.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed video ADC applications.

Compared with AD876JR-8, AD9203ARUZ offers double the sampling rate but demands tighter power integrity and adds interface complexity, while MAX1186ECM+ simplifies layout at the expense of reference configurability and power management - making AD876JR-8 optimal for +5 V, variable-span, battery-aware video digitization.

Availability

AD876JR-8 is available at Aetrix Electronics and suitable for color scanner signal chains, digital copier imaging paths, electronic still camera preview subsystems, and camcorder baseband digitization requiring stable component supply across industrial and consumer production cycles.

Supply support for AD876JR-8 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 is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and signal conversion.

The AD876 product line was designed specifically for high-speed, low-power video and imaging applications - delivering 10-bit resolution at 20 MSPS with single-supply operation and robust reference interface architecture.

FAQ

What is the maximum input frequency supported by the AD876JR-8 before aliasing becomes problematic?

The AD876JR-8 has a full-power bandwidth of 150 MHz, but its Nyquist limit at 20 MSPS is 10 MHz. To avoid aliasing, analog input signals must be band-limited to <10 MHz using an anti-alias filter. The device's 150 MHz bandwidth ensures minimal amplitude roll-off up to 10 MHz, preserving signal integrity for video applications like 3.58 MHz NTSC digitization. AD876JR-8 performance data confirms usable ENOB down to 10 MHz input.

Does the AD876JR-8 require external reference ICs, or can it operate with resistor-divider references?

The AD876JR-8 supports both approaches: low-cost resistor-divider references (e.g., from AVDD) work for 8-bit applications above ~200 Hz, but 10-bit accuracy requires force-sense configuration with op-amp–buffered references (e.g., AD826) to cancel trace resistance errors. The datasheet specifies 8 mA reference current draw - resistor dividers must sustain this load without droop. AD876JR-8's REFTF/REFBF pins are explicitly rated for 8 mA sink capability.

How does the AD876JR-8 handle input signal biasing for single-supply operation?

The AD876JR-8 accepts ac-coupled inputs centered at mid-supply (e.g., 2.5 V) or dc-coupled signals biased via external op amps like AD817 or AD830. Its input range is 2 V p-p, so proper biasing ensures the full swing fits between REFBF and REFTF voltages. Figure 13–15 in the AD876JR-8 datasheet detail ac-coupling networks and bipolar level-shifting circuits - critical for ground-referenced video sources.

What is the purpose of the CML pin on the AD876JR-8, and how should it be connected?

The CML pin on the AD876JR-8 is a bypass node for an internal bias point and must be connected to AVSS (analog ground) through a 0.1 µF ceramic capacitor. This connection stabilizes internal common-mode voltage and suppresses noise coupling into the analog core. Leaving CML floating or connecting it to other nets degrades DNL and increases harmonic distortion - confirmed in AD876JR-8 functional block diagram and layout guidelines.

Can the AD876JR-8 be used with a 3.3 V digital interface while maintaining +5 V analog operation?

Yes - the AD876JR-8 supports mixed-voltage operation: AVDD = +5 V, DVDD = +5 V, and DRVDD = +3.3 V. This configures digital outputs and CLK input for 3.3 V logic levels (VIH = 2.4 V, VOL = 0.4 V @ 0.6 mA), while preserving analog performance. The datasheet specifies separate DRVDD/DRVSS pins precisely for this purpose, and AD876JR-8 timing parameters are validated under this condition.