TC7109CLW713 - 12-Bit Plus Sign Dual-Slope ADC, 44-PLCC | Microchip
MPN: TC7109CLW713 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.85 | $9.85 |
| 10 | $8.95 | $89.50 |
| 100 | $7.75 | $775.00 |
| 500 | $6.5 | $3,250.00 |
| 1,000 | $5.4 | $5,400.00 |
TC7109CLW713 Overview
A dual-slope integrating ADC is a type of analog-to-digital converter that integrates the input signal over a fixed period, then de-integrates against a reference voltage, producing high noise rejection (especially 50 Hz/60 Hz line-frequency rejection) at the expense of conversion speed. The TC7109 sits in the broader hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. Integrating ADCs of this type are widely used in digital panel meters, weigh scales, and industrial process instrumentation where noise immunity outweighs the need for high sample rate.
Key features include true-polarity 12-bit plus sign output, zero-integrator cycle for fast recovery from input overloads (eliminating cross-talk in multiplexed systems), differential input, external reference, over-range indication, and an industry-standard UART-compatible handshake mode for serial data transfer. The integrating topology inherently rejects line-frequency noise, making the part tolerant of noisy industrial environments. Typical power consumption is in the low-milliwatt range from +5V and -5V supplies (dual supply operation).
Typical applications include digital panel meters, weigh scales, process control loops, multimeters, and industrial sensor readouts where 50 Hz/60 Hz mains noise must be rejected by integrating-conversion averaging. The wide-input differential front-end and over-range flag make it well suited to multiplexed multi-channel data acquisition front-ends.
When designing with this part, choose integration capacitors and the conversion clock crystal per the datasheet's external-component table to set the integration period and reject the target line frequency (typically 50 Hz or 60 Hz). Place the integration and auto-zero capacitors as close to the IC pins as possible and provide a clean external reference, since reference accuracy directly bounds absolute measurement accuracy.
Drop-in alternatives for TC7109CLW713 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TC7109CPL
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ICL7109CPL+
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TC7109ACLW
✅ Drop-In📋 Reference alternative (not in catalog)
ICL7109CM44
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX1302ECM+
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TC7109CLW713 Maximum Ratings & Electrical Characteristics
| Resolution | 12 bit + sign |
| Architecture | Dual-slope integrating |
| Number of Inputs | 1 (differential) |
| Data Interface | Parallel, Handshake (UART-compatible) |
| Input Type | Differential |
| Reference Type | External |
| Package | 44-LCC (PLCC, J-Lead) 16.59 x 16.59 mm |
| Mounting Type | Surface Mount |
| Operating Temperature | 0C to 70C |
| Packaging | Tape & Reel (TR) |
| Conversion Method | Integrating with zero-integrator cycle |
TC7109CLW713 Pin Configuration
| Pin 1 | GND — Digital ground |
| Pin 2 | STATUS — Conversion status output |
| Pin 3 | POL — Polarity indicator |
| Pin 4 | OR — Over-range output |
| Pin 5 | B12 — Bit 12 (MSB) parallel output |
| Pin 6 | B11 — Bit 11 parallel output |
| Pin 7 | B10 — Bit 10 parallel output |
| Pin 8 | B9 — Bit 9 parallel output |
| Pin 9 | B8 — Bit 8 parallel output |
| Pin 10 | B7 — Bit 7 parallel output |
| Pin 11 | B6 — Bit 6 parallel output |
| Pin 12 | B5 — Bit 5 parallel output |
| Pin 13 | B4 — Bit 4 parallel output |
| Pin 14 | B3 — Bit 3 parallel output |
| Pin 15 | B2 — Bit 2 parallel output |
| Pin 16 | B1 — Bit 1 (LSB) parallel output |
| Pin 17 | TEST — Test pin |
| Pin 18 | LBEN — Low byte enable |
| Pin 19 | HBEN — High byte enable |
| Pin 20 | CE — Chip enable |
| Pin 21 | MODE — Direct/Handshake mode select |
| Pin 22 | OSC3 — Oscillator pin 3 |
| Pin 23 | OSC2 — Oscillator pin 2 |
| Pin 24 | OSC1 — Oscillator pin 1 |
| Pin 25 | BUF — Buffer amplifier output |
| Pin 26 | AZ — Auto-zero capacitor |
| Pin 27 | INT — Integrator capacitor |
| Pin 28 | V- — Negative supply |
| Pin 29 | REF HI — Reference high input |
| Pin 30 | REF LO — Reference low input |
| Pin 31 | IN HI — Differential input high |
| Pin 32 | IN LO — Differential input low |
| Pin 33 | COMMON — Analog common |
| Pin 34 | NC — Not connected (per datasheet) |
| Pin 35 | NC — Not connected (per datasheet) |
| Pin 36 | V+ — Positive supply |
| Pin 37 | NC — Not connected (per datasheet) |
| Pin 38 | NC — Not connected (per datasheet) |
| Pin 39 | NC — Not connected (per datasheet) |
| Pin 40 | NC — Not connected (per datasheet) |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
TC7109CLW713 is suitable for 6 applications: Digital Panel Meter, Weigh Scale / Load Cell Readout, Industrial Process Control Loop, Handheld Digital Multimeter, Temperature Measurement with Thermocouple/RTD Front End, Multiplexed Data Acquisition Front End.
Digital Panel Meter
The TC7109CLW713's 12-bit plus sign resolution and dual-slope integrating architecture make it ideal for digital panel meter readouts. The integrating topology inherently rejects 50 Hz/60 Hz mains hum, so a noisy industrial mains environment does not require additional filtering. Driven from a +/-5 V dual supply with an external reference, the part drives parallel or UART-handshake output directly to the display or host microcontroller. Per the Microchip TC7109A datasheet typical application circuit, only 8 passive components plus one crystal are needed, keeping BOM cost low. Compared with a sigma-delta ADC, the TC7109 gives slower conversions but cleaner readings in industrial environments.
Recommended
Weigh Scale / Load Cell Readout
In weigh-scale designs the TC7109CLW713 reads differential load-cell signals with high common-mode rejection and inherent line-frequency noise rejection from the dual-slope integrating conversion. The 12-bit plus sign output covers +/- 4096 counts, sufficient for typical commercial scale calibration. The zero-integrator cycle provides fast recovery from overload transients when the load is removed, eliminating the cross-talk seen in multiplexed systems. The external reference voltage directly sets full-scale calibration accuracy, so a low-drift reference such as a bandgap or buried-Zener is recommended for production calibration stability.
Recommended
Industrial Process Control Loop
Process-control loops benefit from the TC7109CLW713's differential input and over-range indication, allowing direct connection to 4-20 mA loop-derived shunt voltages with proper scaling resistors. The integrating architecture rejects mains-frequency noise common in factory environments, and the over-range flag signals the host controller when the input exceeds the calibrated range, enabling alarm triggering. Per the TC7109A datasheet, the handshake mode allows direct connection to an industry-standard UART, simplifying host integration with industrial PLCs and embedded HMI panels that expect serial digital readout.
Recommended
Handheld Digital Multimeter
The TC7109CLW713 has historically been the core converter in handheld digital multimeters, where its 12-bit plus sign resolution covers autoranging voltage/current measurements and the integrating topology provides clean readings despite noisy switch-mode power-supply rails. The handshake mode simplifies the interface to the meter's microcontroller, and the low power consumption supports battery operation. The 44-PLCC J-lead package is mechanically robust for handheld assemblies, and the 0 to 70C commercial temperature range covers indoor and field-use conditions without requiring the extended industrial grade.
Recommended
Temperature Measurement with Thermocouple/RTD Front End
When paired with a thermocouple or RTD front-end amplifier, the TC7109CLW713 provides stable temperature readout thanks to the dual-slope integrator's ability to reject mains-coupled noise picked up by long sensor leads. The differential input accepts the amplified sensor signal directly, and the external reference determines the absolute temperature scale calibration. Compared with successive-approximation converters, the TC7109 trades conversion speed for noise immunity, which is acceptable when measuring slow-changing thermal processes such as industrial ovens, environmental chambers, and HVAC duct sensors.
Recommended
Multiplexed Data Acquisition Front End
In a multiplexed multi-channel data acquisition card, the TC7109CLW713's zero-integrator cycle eliminates cross-talk between channels by resetting the integrator after each conversion, allowing rapid channel-to-channel transitions without residual charge errors. The over-range output flags out-of-range channels to the host controller, and the handshake mode allows the host to read conversion results on demand without polling overhead. The 44-PLCC package gives sufficient pin count for the 12-bit plus sign parallel bus, control signals, and analog front-end interface.
Recommended
Recommended Products Summary
Engineering reference data for TC7109CLW713 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TC7109ACLW | ICL7109CM44 | TC7109CPL | ICL7109CPL+ | MAX1302ECM+ |
|---|---|---|---|---|---|---|
| Package | 44-PLCC (J-Lead) 16.59x16.59 mm | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 40-PDIP - different package | 40-PDIP - different package | 44-PLCC (J-Lead) - same |
| Brand | Microchip Technology | Microchip Technology | Renesas Electronics (ex-Intersil) | Microchip Technology | Renesas Electronics | Analog Devices |
| Resolution | 12 bit + sign | 12 bit + sign | 12 bit + sign | 12 bit + sign | 12 bit + sign | 12/14 bit SAR |
| Architecture | Dual-slope integrating | Dual-slope integrating | Dual-slope integrating | Dual-slope integrating | Dual-slope integrating | SAR (successive approximation) |
| Data Interface | Parallel / Handshake (UART) | Parallel / Handshake | Parallel / Handshake | Parallel / Handshake | Parallel / Handshake | Serial SPI/QSPI/MICROWIRE |
| Operating Temperature | 0C to 70C | 0C to 70C | 0C to 70C | 0C to 70C | 0C to 70C | -40C to +85C (extended) |
| Reference Type | External | External | External | External | External | Internal / External |
| Packaging | Tape & Reel (TR) | Tube | Tube/TR | Tube | Tube | Tube/TR |
Key Differentiators
- Dual-slope integrating topology with zero-integrator cycle (vs MAX1302ECM+ (SAR ADC))
- Differential input with external reference (vs ICL7109CPL+ (40-PDIP variant))
- Handshake (UART-compatible) digital interface (vs MAX1306ECM+ (SPI/QSPI SAR ADC))
Design Notes
Place the integration capacitor (CINT) and the auto-zero capacitor (CAZ) as physically close to the TC7109CLW713 INT and AZ pins as possible, using short traces to minimize leakage and stray capacitance. Per the Microchip TC7109A datasheet, integrator capacitor dielectric type materially affects conversion accuracy - polypropylene or NP0/C0G ceramic are recommended over X7R for the integrator. Provide a solid analog ground plane under the analog section and a separate digital ground return to avoid digital switching currents corrupting the integrator ramp.
A common pitfall is forgetting the dual-supply requirement: the TC7109CLW713 needs both a positive (V+) and negative (V-) supply, typically +/-5 V, with the negative rail generated by a small inverting charge pump or a linear regulator. Connecting only a single supply will not bias the analog input correctly. Also note that the conversion clock crystal sets the integration period, which must be a multiple of the local mains period (50 Hz or 60 Hz) to achieve the datasheet-specified normal-mode rejection.
Keep digital outputs (B1-B12, STATUS, POL, OR, CE, LBEN, HBEN) routed away from the analog inputs (IN HI, IN LO) and the integrator node to prevent digital coupling from disturbing the integrator ramp. Add a guard trace tied to analog COMMON around the integrator capacitor footprint if the board allows. The 44-PLCC J-lead package has generous lead spacing that simplifies hand-soldered rework, but in production a reflow profile per JEDEC J-STD-020 with MSL-appropriate handling is recommended.
Compliance Information
Compliance status not directly stated in the verified web data. As an older mature Microchip part in 44-PLCC, lead-free reflow capability is typical but RoHS/REACH certification should be verified against Microchip's current material declaration before use in regulated markets. Not AEC-Q100 qualified - the 0C to 70C commercial temperature range indicates consumer/industrial use, not automotive.
