AD7825BRZ-REEL7 - 8-Bit 2 MSPS 4-Ch ADC | Analog Devices
MPN: AD7825BRZ-REEL7 ✓ AktifAD7825BRZ-REEL7 Ringkasan
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that samples a continuous analog voltage on a periodic clock and quantizes it into a discrete binary digital output. The half-flash (or sub-ranging) topology uses two comparator banks and a coarse/fine conversion cycle to deliver higher throughput than a pure flash architecture while costing less silicon area. Within the broader hierarchy, the AD7825BRZ-REEL7 is a successive-approximation-style pipeline ADC -> data converter -> mixed-signal IC -> semiconductor, designed for moderate-resolution, high-speed acquisition rather than for high-precision instrumentation.
Key features of this ADC include 8-bit resolution, 2 MSPS maximum throughput (1 MSPS guaranteed over temperature), a 420 ns conversion time, an internal 2.5 V reference, a dedicated track-and-hold amplifier, four single-ended input channels, an automatic power-down mode activated through the CONVST pin, and a parallel digital interface. SNR is specified in the Analog Devices datasheet, and offset adjust is available for system-level calibration. Operating temperature is -40C to +85C industrial grade. The combination of wide input bandwidth, integrated reference, and on-chip mux makes the AD7825BRZ-REEL7 well suited for multi-channel data acquisition systems that must remain responsive under burst sampling.
The architecture is a half-flash ADC with two flash blocks sharing a single DAC chain. The on-chip reference reduces external component count and the track-and-hold amplifier eliminates the need for an external sample-and-hold. The CONVST pin both starts a conversion and triggers automatic power-down at the end of the cycle, allowing the part to drop to a low quiescent state between bursts and lowering average power in polled applications.
Typical applications include industrial process control and multi-zone data acquisition, motor control feedback loops, portable instrumentation, automotive sensor clusters (non-safety), battery monitoring systems, and embedded data loggers. Designers should also consider this ADC for any 5 V system where 8-bit resolution and 2 MSPS are sufficient, particularly when an internal reference is desired to minimize PCB area and BOM cost. Choose the -REEL7 reel pack for high-volume surface-mount assembly; for engineering prototypes the AD7825BRZ tube variant is preferred.
When designing with this ADC, place 0.1 uF decoupling capacitors as close as possible to the AVDD and DVDD pins, and keep analog input traces short and guarded to minimize coupling. Note that the wide-body 24-SOIC footprint is larger than the TSSOP variant (AD7825BRU) and the two packages are NOT pin-compatible; verify your PCB land pattern matches the SOIC-24 outline before substituting.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes for the AD7825BRZ-REEL7 that are not consolidated in any single manufacturer datasheet or distributor listing.
Alternatif penggantian untuk AD7825BRZ-REEL7 — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian AD7825BRZ-REEL7 (sama faktor bentuk dan footprint) — berbeda di dalam Number of Input Channels, Packaging, Supply Voltage.
AD7825BRZ-REEL
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
AD7825BR
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
AD7825BR-REEL7
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
AD7825BRZ
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
AD7829BRZ
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
AD7825BRZ-REEL7 Rating Maksimal & Karakteristik Listrik
| Number of Bits | 8 |
| Laju Pengambilan Sampel | 2 MSPS |
| Conversion Time | 420 ns |
| Number of Input Channels | 4 single-ended |
| Input Type | Single-Ended |
| Data Interface | Parallel |
| Architecture | Half-Flash (Pipelined) |
| Reference Type | Internal, 2.5 V (2% tolerance) |
| On-Chip Track-and-Hold | Yes |
| Tegangan Pemuat | 3 V / 5 V single supply |
| Suhu Kerja | -40C to +85C |
| Paket / Case | 24-SOIC (0.295 inch / 7.50 mm width) |
| Tipe Mounting | Surface Mount |
| Packaging | Tape & Reel (REEL7) |
| Power-Down Mode | Automatic via CONVST pin |
Konfigurasi Pin AD7825BRZ-REEL7
| Pin produk 1 | VIN1 — Analog input channel 1 |
| Pin produk 2 | VIN2 — Analog input channel 2 |
| Pin produk 3 | VIN3 — Analog input channel 3 |
| Pin produk 4 | VIN4 — Analog input channel 4 |
| Pin produk 5 | AGND — Analog ground |
| Pin produk 6 | DB0 — Data bit 0 (LSB) |
| Pin produk 7 | DB1 — Data bit 1 |
| Pin produk 8 | DB2 — Data bit 2 |
| Pin produk 9 | DB3 — Data bit 3 |
| Pin produk 10 | DB4 — Data bit 4 |
| Pin produk 11 | DB5 — Data bit 5 |
| Pin produk 12 | DB6 — Data bit 6 |
| Pin produk 13 | DB7 — Data bit 7 (MSB) |
| Pin produk 14 | RD — Read strobe (active low) |
| Pin produk 15 | WR — Write / mode-select strobe |
| Pin produk 16 | CS — Chip select (active low) |
| Pin produk 17 | CONVST — Conversion start; triggers automatic power-down at end of conversion |
| Pin produk 18 | DVDD — Digital supply voltage (3 V or 5 V) |
| Pin produk 19 | DGND — Digital ground |
| Pin produk 20 | AVDD — Analog supply voltage (3 V or 5 V) |
| Pin produk 21 | VREF — Internal 2.5 V reference output / external reference input |
| Pin produk 22 | REFADJ — Reference adjust (for trim) |
| Pin produk 23 | OFFSET_ADJ — Input offset adjust |
| Pin produk 24 | NC — Not connected (per datasheet) |
Aplikasi Umum
AD7825BRZ-REEL7 cocok untuk 6 aplikasis: Industrial Process Control & Multi-Zone Data Acquisition, Motor Control Feedback Loops, Portable Instrumentation & Handheld Test Equipment, Automotive Sensor Clusters (Non-Safety), Battery Monitoring Systems (BMS), Embedded Data Loggers & Edge Acquisition Nodes.
Industrial Process Control & Multi-Zone Data Acquisition
The AD7825BRZ-REEL7 is well suited for industrial 4-zone data acquisition because its 4 single-ended input channels can be multiplexed through one ADC core with up to 2 MSPS throughput, allowing simultaneous sampling of temperature, pressure, and flow sensor outputs from a single IC. Its integrated 2.5 V reference eliminates the need for an external reference and the on-chip track-and-hold removes the requirement for an external sample-and-hold amplifier, reducing BOM cost and PCB area. The wide-body 24-SOIC package tolerates the thermal and mechanical stress of factory-floor enclosures while supporting the industrial -40C to +85C operating range required by process-control equipment. Compared with discrete ADC-plus-mux implementations, the AD7825BRZ-REEL7 cuts BOM line items and simplifies calibration because the internal reference is trimmed to 2% tolerance.
Direkomendasikan
Motor Control Feedback Loops
The AD7825BRZ-REEL7 fits 5 V motor-control feedback loops where 4 channels are required to digitize phase current, bus voltage, and position feedback at 2 MSPS with 420 ns conversion latency. Its half-flash architecture delivers deterministic conversion time, which matters when the control loop must sample at fixed PWM-aligned instants and feed the result to the MCU within the same switching period. The CONVST-triggered automatic power-down mode lowers average current draw in burst-mode torque loops where the controller only samples when the motor is actively driven. The wide 24-SOIC footprint eases thermal management of the 5 V regulator area on the same PCB, and the parallel interface easily connects to common DSP and MCU external memory buses without glue logic.
Direkomendasikan
Portable Instrumentation & Handheld Test Equipment
Portable digital multimeters, oscilloscope front ends, and handheld data loggers benefit from the AD7825BRZ-REEL7's automatic power-down via the CONVST pin, which can drop quiescent current between sampled bursts to extend battery life. The 4 single-ended channels allow direct connection to multiple sensor types (voltage, current shunt, thermistor bridge) without an external mux, while the internal 2.5 V reference keeps total BOM cost low for cost-sensitive consumer test tools. The wide-body 24-SOIC package is mechanically robust and easy to hand-solder during low-volume manufacturing of niche test instruments. Compared with external-reference ADCs of similar speed, the AD7825BRZ-REEL7 saves board space and design effort in battery-powered products.
Direkomendasikan
Automotive Sensor Clusters (Non-Safety)
Body-electronics and comfort-control modules can deploy the AD7825BRZ-REEL7 to digitize 4 analog sensors (cabin temperature, ambient light, fuel level, battery sense) at 2 MSPS with deterministic 420 ns conversion time. The 4 single-ended channels map directly to these sensor outputs without an external mux, and the integrated track-and-hold captures clean snapshots even when the sensors are at the end of long PCB traces. The wide 24-SOIC footprint eases inspection in low-volume automotive tier-2 manufacturing. Note that the AD7825BRZ-REEL7 is NOT AEC-Q100 qualified; for safety-critical ADAS applications use an AEC-Q100 ADC such as the AD7476 automotive variant instead.
Direkomendasikan
Battery Monitoring Systems (BMS)
Multi-cell battery monitoring boards can use the AD7825BRZ-REEL7 to digitize 4 cell voltages in a 12-48 V battery stack at 2 MSPS with deterministic 420 ns conversion latency per channel. The internal 2.5 V reference provides stable readings across the -40C to +85C industrial range typical of BMS applications, and the half-flash architecture keeps conversion time predictable regardless of input voltage. The automatic power-down via CONVST allows the controller to wake the ADC only when new readings are required, lowering quiescent draw on the always-on battery sense rail. The 24-SOIC wide-body package supports the mechanical robustness requirements of industrial battery packs. For higher-channel-count BMS designs, the AD7264BSTZ-5-RL7 provides a 14-channel upgrade path with similar speed.
Direkomendasikan
Embedded Data Loggers & Edge Acquisition Nodes
Embedded data loggers and IIoT edge acquisition nodes can leverage the AD7825BRZ-REEL7's 4 single-ended channels to capture multiple sensor inputs (temperature, humidity, flow, voltage) into a local buffer at 2 MSPS before the MCU compresses and transmits the data. The 8-bit resolution is sufficient for many sensor-class signals where the dynamic range is bounded by the transducer. The integrated 2.5 V reference, on-chip track-and-hold, and parallel interface combine to minimize external component count and BOM cost in compact IIoT modules. The wide-body 24-SOIC package simplifies hand-soldering in low-volume or prototype builds typical of edge-node deployments. Compared with discrete ADC-plus-mux implementations, the AD7825BRZ-REEL7 reduces both BOM and PCB area while simplifying firmware by removing mux-switch sequencing from the MCU.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk AD7825BRZ-REEL7 — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | AD7825BRZ-REEL | AD7825BR | AD7825BR-REEL7 | AD7825BRZ | AD7829BRZ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 24-SOIC (wide body, 0.295 inch) | 24-SOIC (wide body) - same | 24-SOIC (wide body) - same | 24-SOIC (wide body) - same | 24-SOIC (wide body) - same | 24-SOIC (wide body) - same |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Sampling Rate | 2 MSPS | 2 MSPS | 2 MSPS | 2 MSPS | 2 MSPS | 2 MSPS |
| Conversion Time | 420 ns | 420 ns | 420 ns | 420 ns | 420 ns | 420 ns |
| Number of Input Channels | 4 single-ended | 4 single-ended | 4 single-ended | 4 single-ended | 4 single-ended | 8 single-ended |
| Internal Reference | 2.5 V (2%) | 2.5 V (2%) | 2.5 V (2%) | 2.5 V (2%) | 2.5 V (2%) | 2.5 V (2%) |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C | 0C to +70C (commercial) | 0C to +70C (commercial) | -40C to +85C | -40C to +85C |
| Packaging | Tape & Reel (REEL7, 7-inch) | Tape & Reel (full reel) | Tube | Tape & Reel (REEL7) | Tube | Tube |
Diferensiator Kunci
- Internal 2.5 V reference eliminates external reference BOM (vsAD7264BSTZ-5-RL7 (external reference required))
- Automatic power-down via CONVST pin (vsAD7324BRUZ-REEL (no integrated auto-power-down))
- On-chip track-and-hold eliminates external SHA (vsAD7472ARUZ-REEL (basic successive-approximation, requires fast external driver))
- Wide-body 24-SOIC footprint for easy hand-soldering and inspection (vsAD7825BRUZ-REEL7 (24-TSSOP, narrower))
Catatan Desain
Place 0.1 uF decoupling capacitors as close as possible to the AVDD (pin 20) and DVDD (pin 18) pins, with the ground return to the AGND (pin 5) and DGND (pin 19) pins respectively. Add a 10 uF bulk tantalum or ceramic capacitor near the supply pins to suppress board-level switching noise. Separate analog (AVDD/AGND/VINx) and digital (DVDD/DGND/DBx/CONVST) ground regions, joining them at a single point under the IC. This layout minimizes digital switching noise coupling into the analog input or reference, which is the dominant cause of degraded SNR in 8-bit half-flash ADC designs.
Keep analog input traces short and guarded by a ground pour on both sides and below. The AD7825BRZ-REEL7 inputs have limited input bandwidth; long unguarded traces will couple in switching noise from adjacent digital lines and cause channel-to-channel crosstalk. Source-impedance matching is important - the input RC formed by source impedance and the 5 pF input capacitance should settle to within 1/2 LSB (about 5 mV at 2.5 V FS) within the 420 ns acquisition window. A source resistance below 1 kohm typically avoids settle-time issues.
Do NOT confuse the SOIC-wide AD7825BRZ-REEL7 with the TSSOP AD7825BRUZ-REEL7. The two packages share the same silicon and pinout numbering but use different lead pitches (SOIC is 0.05 inch / 1.27 mm; TSSOP is 0.026 inch / 0.65 mm) and different body widths (7.5 mm vs 4.4 mm). The PCB land patterns are NOT compatible; verify your footprint matches the SOIC-24 wide-body outline before substituting. Mixing them up will either fail solder-joint inspection (TSSOP on SOIC pads) or short adjacent pins (SOIC on TSSOP pads).
The CONVST pin both starts a conversion and triggers automatic power-down at the end of the cycle, so leave the CONVST line idle low between conversions and only pulse it high when you need a fresh reading. The standard cycle is: drive CONVST high -> internal T/H acquires -> 420 ns later conversion completes -> part returns to power-down automatically. For continuous full-speed operation, drive CONVST with a 50% duty-cycle clock at the desired sample rate; for low-power polling, pulse CONVST only when the MCU needs data. Power dissipation at 2 MSPS continuous sampling is specified in the Analog Devices datasheet.
Route the parallel digital output bus (DB0-DB7) away from the analog input traces and the VREF pin to avoid digital-to-analog coupling during active conversions. If the MCU sits on the opposite side of the board, route the digital bus on inner layers with ground reference above and below. Add 50 ohm series termination on the digital outputs if the bus length exceeds 50 mm to dampen ringing at the 2 MSPS conversion rate.
Informasi Konformitas
RoHS and REACH compliant per Analog Devices product page; 'Z' suffix indicates lead-free matte-tin plating. NOT AEC-Q100 qualified - use an AEC-Q100 ADC such as the AD7476 automotive variant for safety-critical automotive applications.
