MAX162BENG - 12-Bit 3µs SAR ADC, 24-PDIP | Maxim Integrated
MPN: MAX162BENG ✓ Hoạt độngMAX162BENG Tóm tắt
What is an ADC? An analog-to-digital converter (ADC) is a mixed-signal integrated circuit that samples a continuous analog input voltage and converts it into a discrete digital code. The MAX162 belongs to the successive-approximation register (SAR) ADC family, which uses a binary-search algorithm against an internal reference to produce one conversion in N clock cycles. SAR ADCs are prized for low latency (no pipeline delay), deterministic behavior, and excellent DC accuracy - making them ideal for multiplexed data-acquisition systems, industrial process control, and precision instrumentation.
Key differentiating features include a 308 ksps sampling rate (3 µs per conversion), on-chip buried-zener reference with ±5 ppm/°C typical drift, ±15 V input range with protection to ±25 V, ±5 V or +5 V single-supply operation, and a track/hold amplifier on the analog input. The internal reference and reference buffer keep external component count low; only decoupling capacitors are required. The 24-pin PDIP package is also intended for retrofit designs, breadboards, and legacy 24-pin ADC sockets where surface-mount conversion is impractical.
Architecturally, the MAX162 uses a capacitively-weighted SAR core clocked from an internal oscillator. Each conversion runs the SAR logic against a switched-capacitor DAC tied to the buried-zener reference, then latches the result into the output latch for parallel read. Because the reference is on-chip, accuracy depends on REF decoupling and PCB layout cleanliness, not on an external reference IC.
Typical applications include multichannel data-acquisition front ends using analog multiplexers, digital panel meters, portable instrumentation with battery-stack monitoring up to ±15 V, process-control analog input modules on PLCs, and precision transducer readouts. The wide bipolar input range also makes it convenient for direct connection to industrial ±10 V signals after a simple resistive divider.
When designing with the MAX162BENG, place the supply-decoupling capacitors within 50 mm of the VDD and VSS pins and keep the analog input traces short and guarded. Avoid running digital outputs parallel to the analog input trace; the parallel interface can couple noise into the comparator during the conversion window if layout is poor.
This page consolidates distributor pricing, drop-in equivalents, and design guidance beyond what the Maxim datasheet provides, including a comparison with the MX7572 family and the MAX197 8-channel 12-bit ADC.
Bộ thay thế dễ dàng lắp đặt cho MAX162BENG — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MAX162BENG (cùng hình factor và footprint) — khác nhau ở Package, Data Interface, Mounting Type, Conversion Time, Operating Temperature.
MX7572JN05+
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MX7572KN12+
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MAX162BCNG+
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MAX128BENG
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX162BENG Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bits |
| Number of Inputs | 1 |
| Input Type | Single-Ended |
| Architecture | SAR (Successive Approximation) |
| Tỷ lệ lấy mẫu | 308 ksps (3 µs per conversion) |
| Conversion Time | 3 µs (MAX162); 5 µs / 12 µs (MX7572 family) |
| Data Interface | Parallel |
| Phạm vi điện áp đầu vào | 0 to +5 V (single-supply) / ±15 V (dual-supply) |
| On-Chip Reference | Buried Zener, low drift, low noise |
| Điện áp cung cấp | +5 V (digital); ±5 V analog (dual-supply option) |
| Sample-and-Hold | On-chip wideband track/hold |
| Integral Nonlinearity (INL) | 0.024% (1 LSB max) typical |
| Nhiệt độ hoạt động | 0 °C to +70 °C (B grade, commercial) |
| Hộp | 24-PDIP (Plastic DIP, Through-Hole) |
| Số lượng chân | 24 |
| Kiểu lắp đặt | Through-Hole |
| Lead Finish / RoHS | Lead-free / RoHS compliant ('+' suffix) |
| Compatible Family | MX7572 (slower, pin-compatible alternate) |
Cấu hình chân MAX162BENG
| Chân 1 | VSS — Negative analog supply (-5 V or GND) |
| Chân 2 | VEE — Negative analog supply (or -15 V for bipolar) |
| Chân 3 | AGND — Analog ground |
| Chân 4 | AIN — Analog input (single-ended) |
| Chân 5 | REF — Internal reference bypass |
| Chân 6 | REFADJ — Reference adjust / trim |
| Chân 7 | DGND — Digital ground |
| Chân 8 | CS — Chip select (active low) |
| Chân 9 | RD — Read strobe (active low) |
| Chân 10 | BUSY — Conversion in progress (active high) |
| Chân 11 | CLK — External clock (or internal if tied) |
| Chân 12 | WR — Write/convert start |
| Chân 13 | DB11 — Data bit 11 (MSB) |
| Chân 14 | DB10 — Data bit 10 |
| Chân 15 | DB9 — Data bit 9 |
| Chân 16 | DB8 — Data bit 8 |
| Chân 17 | DB7 — Data bit 7 |
| Chân 18 | DB6 — Data bit 6 |
| Chân 19 | DB5 — Data bit 5 |
| Chân 20 | DB4 — Data bit 4 |
| Chân 21 | DB3 — Data bit 3 |
| Chân 22 | DB2 — Data bit 2 |
| Chân 23 | DB1 — Data bit 1 (LSB) |
| Chân 24 | VDD — +5 V digital supply |
Ứng dụng tiêu biểu
MAX162BENG phù hợp cho 6 Áp dụngs: Industrial Data-Acquisition Front End, Digital Panel Meter and Instrumentation, Precision Transducer Readout, Battery-Stack Monitoring (Up to ±15 V), Process Control Analog Input Module, Portable Test and Measurement.
Industrial Data-Acquisition Front End
The MAX162BENG suits multichannel data-acquisition systems that read bipolar ±10 V or ±15 V industrial signals through a resistive divider. Its 3 µs conversion time provides 308 ksps throughput, while the on-chip 12-bit resolution and buried-zener reference deliver ±1 LSB linearity for accurate PLC analog-input modules. Place the part after an external 8 or 16-channel analog multiplexer (e.g. MAX336) and a simple unity-gain buffer for high-impedance sources. The single +5 V digital supply simplifies interface to 5 V CMOS logic, and the parallel 12-bit output latches cleanly into an FPGA or microcontroller data bus.
Được đề xuất
Digital Panel Meter and Instrumentation
The MAX162BENG is well suited for 3.5-digit or 4.5-digit digital panel meters, precision multimeters, and benchtop instrumentation where 12-bit accuracy and 3 µs settling time are enough. Combined with an ICL7107/ICL7109-style display driver or an MCU-driven LCD, the MAX162 provides a stable, repeatable conversion with the on-chip reference reducing long-term drift to ~5 ppm/°C typical. Designers use the INT/OUT pin to trigger display latches, and the CS/RD pins for handshake with the host MCU. Battery-powered portable instruments benefit from the part's modest supply current in standby.
Được đề xuất
Precision Transducer Readout
Bridge and strain-gauge transducers output low-level differential signals that must be digitized with high DC accuracy. The MAX162BENG's internal reference and ±1 LSB typical INL make it a good fit for direct connection to conditioned strain-gauge or load-cell outputs. The 3 µs conversion window is more than fast enough for 1 kHz mechanical bandwidth sensors, and the parallel interface simplifies timing inside dedicated readout boards. Combined with an instrumentation amp such as the MAX4193 front-end, designers build 12-bit force or pressure readouts without an external reference.
Được đề xuất
Battery-Stack Monitoring (Up to ±15 V)
The MAX162BENG's ±25 V tolerant analog inputs let it directly digitize the per-cell voltage of series-connected battery stacks without a divider network for ±15 V systems. For 48 V lithium packs, an external 100 kΩ/10 kΩ divider scales the signal into the ±5 V analog input range, leveraging the MAX162's full-scale resolution. The 3 µs conversion enables cell sampling at sub-millisecond rates per channel, supporting active cell-balancing feedback loops. Designers use the RD/CS handshake to script scan sequence in the host MCU.
Được đề xuất
Process Control Analog Input Module
Programmable-logic-controller (PLC) analog input modules digitize 4-20 mA or 0-10 V signals from sensors and transmitters. The MAX162BENG accepts these ranges directly via simple resistor scaling, delivering 12-bit results into the PLC backplane or local MCU. The internal reference keeps calibration stable over industrial temperature ranges, and the DIP-24 form factor works in legacy PLC-3 and PLC-5 form-factor PCBs that were designed around the 24-pin ADC footprint. This makes it attractive for retrofit and maintenance of installed PLC equipment.
Được đề xuất
Portable Test and Measurement
Portable oscilloscope-style instruments and handheld meters require low-power, single-supply 12-bit ADCs. The MAX162BENG runs from a single +5 V rail with milliwatt-level dissipation, operates from a lithium-battery boost converter, and exposes a 12-bit parallel output that small MCUs can read directly. Combined with a MAX150AEWP+T power supervisor and a MAX1284BCSA SPI-controlled 12-bit ADC as a backup channel, designers build compact, ruggedized test gear. The 24-PDIP footprint is also socketed for field replacement by maintenance technicians.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX162BENG — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | MX7572JN05+ | MX7572KN12+ | MAX162BCNG+ | MAX128BENG | AD574AJN |
|---|---|---|---|---|---|---|
| Package | 24-PDIP (Through-Hole) | 24-PDIP - same | 24-PDIP - same | 24-PDIP (industrial temp grade) - same | 24-PDIP - same | 28-PDIP - different (cross-package) |
| Brand | Maxim Integrated | Maxim Integrated - same | Maxim Integrated - same | Maxim Integrated - same | Maxim Integrated - same | Analog Devices - cross-brand |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Number of Inputs | 1 (single-ended) | 1 | 1 | 1 | 8 (with MUX) | 1 |
| On-Chip Reference | Yes (buried-zener) | Yes | Yes | Yes | Yes (internal 4.096V) | External reference required |
| Operating Temperature | 0 to +70 °C (B grade) | 0 to +70 °C | 0 to +70 °C | -40 to +85 °C (industrial) | -40 to +85 °C | 0 to +70 °C |
Bảo phân biệt quan trọng
- Faster conversion than MX7572 family (vsMX7572JN05+)
- True drop-in pin compatibility with MX7572 family (vsAD574AJN)
- Integrated buried-zener reference vs external reference required on AD574A (vsAD574AJN)
- Multi-channel capability of MAX128 family (vsMAX128BENG)
Ghi chú thiết kế
Decouple VDD (+5 V digital) and VEE (-5 V or -15 V for bipolar operation) with a 0.1 µF ceramic capacitor in parallel with a 10 µF tantalum, placed within 5 mm of each supply pin. Reference bypass (REF pin) requires 10 µF tantalum parallel with 0.1 µF ceramic. Sharing a single ground plane can couple digital switching noise into the analog comparator; split AGND and DGND under the IC and join them only at the package thermal pad or AGND pin. Estimated: total quiescent dissipation is ~150 mW for ±5 V supplies (5 mA × 15 V effective), so no heatsink is required even at industrial temperatures.
Keep the AIN trace short (≤25 mm) and guarded on both sides by AGND copper. Avoid running parallel data bus lines (DB0-DB11) under or adjacent to AIN - the parallel outputs switch during RD and can couple noise into the comparator for 200-300 ns after RD. Place a 100 Ω series resistor in AIN for additional overvoltage protection beyond the ±25 V internal clamp. For sockets, use a quality machined-pin DIP-24 socket (e.g. Aries 24-DIP) to preserve signal integrity at 3 µs conversion rates.
The MAX162BENG samples the input at the falling edge of WR; ensure the analog input is settled to within ±0.5 LSB of its final value before WR rises to start a conversion. Add a 4th-order RC anti-alias filter at AIN with -3 dB cutoff at 0.45 × sampling rate (e.g. 138 kHz for 308 ksps throughput). The internal track/hold has 50 ns aperture delay; the host MCU must gate any input MUX switching to avoid sample crosstalk. Estimated: front-end bandwidth should be ≤45 kHz for 12-bit accuracy at full speed.
Do NOT drive AIN below -25 V or above +25 V - the input protection diodes clamp transients, but sustained overvoltage destroys the part. The INT/OUT pin is open-drain and requires a pull-up resistor (10 kΩ to VDD). The RD signal must NOT be asserted while BUSY is high - reading during conversion returns invalid data and may corrupt the SAR internal state. Always wait for the falling edge of BUSY before latching DB0-DB11.
Thông tin tuân thủ
MAX162BENG+ suffix denotes RoHS-compliant lead-free version per Maxim product page. Standard MAX162BENG (without '+') is legacy lead-finish version. AEC-Q100 not applicable (commercial-grade part - choose MAX162BCNG+ for industrial extended temperature).
