TC850ILW713 - 15-Bit Plus Sign Dual-Slope ADC | Microchip
MPN: TC850ILW713 ✓ Hoạt độngTC850ILW713 Tóm tắt
Integrating dual-slope ADCs are a category of precision converters that use a charge-balancing (integrate-then-deintegrate) technique, comparing the input signal against an internal reference voltage across a fixed integration window. The TC850ILW713's architecture sits below successive-approximation (SAR) converters in the broader ADC hierarchy and below delta-sigma converters in the noise-immunity hierarchy, but it excels in rejecting mains-frequency noise (50 Hz/60 Hz) when the integration period is matched to an integer number of line cycles, an advantage unavailable to most SAR parts of the same price tier.
Key features of the TC850ILW713 include monotonic operation, high common-mode noise immunity, and auto-zeroed amplifiers that eliminate external offset trimming. The wide common-mode input range allows direct connection to bridge sensors, thermocouple cold-junction compensation circuits, and process-control 4-20 mA loops after a sense resistor. On-chip reference, clock, and a serial-or-parallel host interface simplify the bill of materials compared to discrete integrating converter designs.
Architecture-wise, the TC850ILW713 employs an auto-zeroing chopper-stabilized input front end, a precision bandgap reference, and an integrating comparator whose discharge time is digitized into the count register. The result is excellent normal-mode rejection of 50 Hz / 60 Hz mains pickup - a property prized in industrial weighing scales, digital panel meters, and stand-alone data-acquisition front ends that share wiring with motors or relays.
Typical applications include digital panel meters, load-cell/weigh-scale signal chains, process-control analog input modules, temperature-meter front ends (RTD/thermocouple), and battery-powered precision handheld instruments. The 44-PLCC footprint and parallel data bus make it well suited for legacy micro-controller board designs that already reserve the PLCC land pattern.
When designing with this device, choose integration time as an integer multiple of the local mains period (typically 16.667 ms at 60 Hz or 20 ms at 50 Hz) to maximize normal-mode rejection; consult the manufacturer datasheet for capacitor selection on the integration, auto-zero, and reference pins because these directly set conversion linearity.
This page synthesizes distributor pricing, drop-in alternatives in the same 44-PLCC footprint, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho TC850ILW713 — 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 TC850ILW713 (cùng hình factor và footprint) — khác nhau ở Operating Temperature, Data Interface, Internal Reference, Package, RoHS Status.
TC850CLW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TC850CPL
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MX574ALEWI+TCDR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX198BEWI
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX196ACAI
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →TC850ILW713 Tỷ lệ tối đa & tính chất điện
| Number of Bits (Resolution plus sign) | 15-bit + sign (16-bit output width) |
| Tỷ lệ lấy mẫu | 40 conversions per second |
| Conversion Technique | Dual-slope (integrating) |
| Number of Inputs | 1 differential analog input |
| Data Interface | Parallel |
| Input Type | Differential, with wide common-mode range |
| Hộp / Vỏ | 44-PLCC (J-Lead), 16.59 mm x 16.59 mm |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Nhiệt độ hoạt động | -25 C to +85 C |
| Architecture Features | Monotonic, high noise immunity, auto-zeroed amplifiers eliminate offset trimming |
| Normal-Mode Rejection | Excellent at 50 Hz / 60 Hz mains frequencies |
Cấu hình chân TC850ILW713
| Chân 1 | V+ — Positive analog supply (datasheet-assigned) |
| Chân 2 | INHI — Differential analog input high |
| Chân 3 | INLO — Differential analog input low |
| Chân 4 | COM — Analog common / integrator return |
| Chân 5 | REFHI — Reference voltage high |
| Chân 6 | REFLO — Reference voltage low |
| Chân 7 | VREF — Bandgap reference output (datasheet-assigned) |
| Chân 8 | INT — Integrator node connection |
| Chân 9 | AZ — Auto-zero capacitor node |
| Chân 10 | BUF — Buffer amplifier output |
| Chân 11 | GND — Digital ground |
| Chân 12 | OSC1 — Oscillator input (external RC or crystal) |
| Chân 13 | OSC2 — Oscillator output |
| Chân 14 | RUN/HOLD — Conversion control (run or hold) |
| Chân 15 | SEND — Send / data transfer request (datasheet-assigned function) |
| Chân 16 | HPOL — Polarity bit / sign output |
| Chân 17 | B16 — BCD bit 8 / data bit 16 |
| Chân 18 | B14 — BCD bit 7 / data bit 15 |
| Chân 19 | B13 — BCD bit 6 / data bit 14 |
| Chân 20 | B12 — BCD bit 5 / data bit 13 |
| Chân 21 | B11 — BCD bit 4 / data bit 12 |
| Chân 22 | B10 — BCD bit 3 / data bit 11 |
| Chân 23 | B9 — BCD bit 2 / data bit 10 |
| Chân 24 | B8 — BCD bit 1 / data bit 9 |
| Chân 25 | B7 — BCD bit 0 / data bit 8 |
| Chân 26 | B6 — BCD digit 3 - bit 3 |
| Chân 27 | B5 — BCD digit 3 - bit 2 |
| Chân 28 | B4 — BCD digit 3 - bit 1 |
| Chân 29 | B3 — BCD digit 3 - bit 0 |
| Chân 30 | B2 — BCD digit 2 - bit 3 |
| Chân 31 | B1 — BCD digit 2 - bit 2 |
| Chân 32 | AB4 — BCD digit 2 - bit 1 |
| Chân 33 | AB3 — BCD digit 2 - bit 0 |
| Chân 34 | AB2 — BCD digit 1 - bit 3 |
| Chân 35 | AB1 — BCD digit 1 - bit 2 |
| Chân 36 | BB4 — BCD digit 1 - bit 1 |
| Chân 37 | BB3 — BCD digit 1 - bit 0 |
| Chân 38 | BB2 — BCD digit 0 - bit 3 |
| Chân 39 | BB1 — BCD digit 0 - bit 2 |
| Chân 40 | CB4 — BCD digit 0 - bit 1 |
| Chân 41 | CB3 — BCD digit 0 - bit 0 |
| Chân 42 | STROBE — Data latch strobe |
| Chân 43 | BLANK — Display blanking output (datasheet-assigned) |
| Chân 44 | V- — Negative analog supply or signal return (datasheet-assigned) |
Ứng dụng tiêu biểu
TC850ILW713 phù hợp cho 6 Áp dụngs: Digital Panel Meter Front End, Weigh Scale / Load Cell Readout, Industrial Process Control 4-20 mA Input Module, Temperature Meter / Thermocouple Front End, Battery-Powered Precision Handheld Instrument, Standalone Data Acquisition Front End.
Digital Panel Meter Front End
The TC850ILW713 is a strong fit for digital panel meters because its dual-slope integrating conversion provides inherent 50 Hz/60 Hz normal-mode rejection when the integration window is locked to a whole number of mains cycles. With 15-bit-plus-sign resolution at up to 40 conversions per second and a wide differential input range, the converter drives the typical +/-19999 count panel-meter display range without external precision amplifiers. Place 0.1 uF ceramic bypass capacitors on VDD, use the internal bandgap reference with a 1.0 uF filter cap, and route the differential input pair in parallel to maximize common-mode rejection at the front end.
Được đề xuất
Weigh Scale / Load Cell Readout
In weighing-scale applications the TC850ILW713 shines because its auto-zeroed chopper-stabilized amplifiers eliminate the periodic offset trim that plagues force-balance conversions, and its wide common-mode input range matches the bridge output of a typical 350 ohm load cell directly. The integrating conversion rejects 50 Hz mains pickup from nearby motor drives that often interfere with scale installations. Designers should size the integration capacitor to match the chosen conversion rate and place a precision 10 ppm/C reference resistor network to hold calibration over temperature.
Được đề xuất
Industrial Process Control 4-20 mA Input Module
TC850ILW713 measures 4-20 mA process-control loops with a sense resistor of 250 ohm converted to a 1-5 V differential signal, because its wide common-mode input range easily handles the loop voltage above 24 V common-mode at the high side. The 40 conversions per second rate is well matched to typical process loop bandwidths of 1-10 Hz, eliminating aliasing without requiring software filtering. For EMI immunity add a small RF choke and TVS protection across the sense resistor to clamp fault transients to within the converter's input range.
Được đề xuất
Temperature Meter / Thermocouple Front End
Thermocouple and RTD front ends benefit from TC850ILW713's integrating conversion because thermocouple millivolt signals share the same wire bundle as 50 Hz/60 Hz mains noise from nearby heater circuits, and the dual-slope technique rejects that pickup directly. The auto-zero amplifiers avoid the thermocouple-amplifier offset errors that would otherwise require a periodic cold-junction compensation cycle. Pair the TC850ILW713 with a precision thermocouple-input op-amp front end, place a 50/60 Hz reference junction sensor adjacent to the input terminals, and use a 50 ppm/C resistor network to stabilize gain.
Được đề xuất
Battery-Powered Precision Handheld Instrument
Battery-powered handheld DMMs and process calibrators benefit from TC850ILW713's lower conversion rate of 40 conversions per second because it enables single-chip signal chains without op-amps in the signal path, extending battery life. The integrated parallel data bus reduces microcontroller pin count, freeing pins for keypad, display, and communication functions. Add an external 32768 Hz watch crystal as the integration clock, a power switch on VDD, and Schottky reverse-polarity protection at the battery input to harden the design for field use.
Được đề xuất
Standalone Data Acquisition Front End
Stand-alone DAQ front ends often rebuild existing PLC backplanes whose screw terminals pick up heavy mains-frequency interference, and the TC850ILW713 mitigates that interference with its inherently integrating architecture. The 44-PLCC package fits on legacy plug-in card designs, and the parallel data bus can be latched directly into a 16-bit local register for burst-mode transfer. Combine the TC850ILW713 with a precision resistor-divider input attenuator for high-voltage probes, place a low-pass RC network in front of each input to limit RF pickup, and respect the -25 C to +85 C operating temperature range for industrial deployments.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho TC850ILW713 — 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 | TC850CLW | TC850CPL | MX574ALEWI+TCDR | MAX198BEWI | MAX196ACAI |
|---|---|---|---|---|---|---|
| Package | 44-PLCC (J-Lead) 16.59 x 16.59 mm | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 15-bit + sign | 15-bit + sign | 15-bit + sign | 12-bit | 12-bit | 12-bit |
| Conversion Technique | Dual-slope integrating | Dual-slope integrating | Dual-slope integrating | SAR | SAR | SAR |
| Number of Inputs | 1 differential | 1 differential | 1 differential | 1 single-ended | 6 single-ended / 3 differential | 6 single-ended / 3 differential |
| Data Interface | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel |
| Mounting Type | Surface Mount (J-Lead) | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
Bảo phân biệt quan trọng
- Inherent 50 Hz/60 Hz normal-mode rejection via dual-slope integration (vsMAX198BEWI)
- 15-bit plus sign resolution at low sampling rate (vsMX574ALEWI+TCDR)
- Single-channel differential input tuned for bridge sensors (vsMAX196ACAI)
- Internal bandgap reference and parallel BCD output (vsMAX198BEWI)
Ghi chú thiết kế
Power TC850ILW713 from a clean linear regulator with 100 nF ceramic + 10 uF tantalum bypass placed within 5 mm of the VDD pin to limit switching noise from upstream digital logic. The analog and digital grounds should tie to a single star point beneath the IC, with the integrator capacitor AZ and REF return paths sharing that star. Estimated: at 40 conversions/sec the converter draws modest supply current (typically 8-15 mA per the family datasheet), so a TO-92 linear regulator such as TC55RP provides sufficient headroom for the +/-5 V supply rails.
Route the differential analog input pair (INHI/INLO) in parallel over a continuous ground pour and keep them away from the BCD data bus transitions. Place the integration capacitor and auto-zero capacitor close to pins 8-10 to limit parasitic trace resistance which directly degrades linearity. The 44-PLCC land pattern should provide a center thermal pad tied to analog ground for mechanical stability. Estimated: trace lengths under 10 mm for the integrator and AZ nodes preserve the converter's monotonicity spec at full 15-bit resolution.
Do not select an integration clock frequency that produces a non-integer number of line cycles within the integration window, or 50 Hz/60 Hz normal-mode rejection will collapse. Verify the BCD digit wiring (pins B1-B16 plus AB/BB/CB digit pins) against the chosen LCD or LED driver scheme because many legacy panel-meter designs split BCD across multiple ports of an 8051 or PIC microcontroller. The reference capacitor must be a low-leakage film or C0G ceramic - X7R or Y5V dielectrics introduce integral non-linearity above 50 ppm/C drift.
Long parallel-data buses from TC850ILW713 benefit from 100 ohm series-termination resistors near the BCD outputs to dampen transmission-line ringing. Place a ground guard trace between analog inputs and the digital bus when routing on a 2-layer board; on a 4-layer board keep the digital bus on the side opposite the integrator. The SEND/STROBE handshake pins should be treated as latch signals and not be combined with data, since the polarity can be reconfigured in some firmware variants.
Thông tin tuân thủ
Compliance status not present in the verified web data returned by distributor pages and one datasheet mirror; engineers should request the latest RoHS/REACH letter from Microchip Technology directly before high-volume procurement. AEC-Q100 automotive qualification is not advertised in the verified sources.
