ADC0834CCWM - 8-Bit 4-Ch Serial I/O ADC, 14-SOIC | Texas Instruments
Teilenummer: ADC0834CCWM ✗ Abgekündigt| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $3.1 | $3,10 |
| 10 | $2.85 | $28,50 |
| 100 | $2.45 | $245,00 |
| 500 | $2.15 | $1.075,00 |
| 1.000 | $1.9 | $1.900,00 |
ADC0834CCWM Übersicht
A successive-approximation ADC (SAR ADC) is a class of data converter that determines the digital output one bit at a time using an internal DAC and comparator. The SAR architecture sits between flash converters (fastest, most expensive) and sigma-delta converters (highest resolution, lowest bandwidth). Multiplexed-input SAR ADCs like the ADC0834 family allow one conversion engine to serve multiple analog channels, which reduces cost and board area when several sensors must be digitized. The device belongs to the broader hierarchy: ADC → data converter → mixed-signal IC → semiconductor.
Key features include differential or single-ended input modes selectable per channel, TTL/MOS-compatible serial data output that can be daisy-chained across multiple converters, and a separate analog/digital ground pin for noise isolation. The configurable input multiplexer supports 2- or 4-channel operation (the ADC0831 has 1 channel, the ADC0832 has 2, the ADC0834 has 4, and the ADC0838 has 8). The serial interface simplifies opto-isolation for remote-sensing applications.
The ADC0834CCWM uses a switched-capacitor DAC ladder and an internal sample-and-hold architecture that acquires the input within the first three clock cycles after address loading. Differential reference operation is supported by tying the REF– pin to VCC/2, allowing bipolar or ratiometric measurements when paired with sensors such as strain gauges or thermocouples. The 32 µs conversion time is short enough for process-control loops and slow data-acquisition tasks.
Typical applications include process-control remote digitizing, transducer interfacing, battery-powered instrumentation, and isolated serial data links. The wide supply tolerance and single 5 V rail also make it suitable for embedded microcontroller systems that need an extra ADC channel beyond the MCU's internal converter.
When designing with this part, place 0.1 µF decoupling capacitors close to the VCC and digital-supply pins and separate analog and digital ground returns to a single star point. Note that the ADC0834 lacks an internal oscillator; the host MCU or CPLD must generate the I/O clock and chip-select sequence.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in-Alternativen für ADC0834CCWM – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit ADC0834CCWM (gleiche Bauform und Footprint) – abweichend in Input Type, Supply Voltage, Data Interface, Number of Input Channels, Sampling Rate.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
ADC0834CCWM/NOPB
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ADC0834BCN/NOPB
✅ Drop-In✓ Auf Lager
$2.95 / Stück
Datenblatt ansehen →ADC0831CCWM
✅ Drop-In✓ Auf Lager
$2.65 / Stück
Datenblatt ansehen →ADC0834CCWM
✅ Drop-In✓ Auf Lager
$1.9 / Stück
Datenblatt ansehen →ADC0834CIWM
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ADC08134CIWM
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ADC0834CCWM Grenzwerte & elektrische Eigenschaften
| Auflösung | 8 bits |
| Number of Input Channels | 2 or 4 (configurable, single-ended or differential) |
| Architecture | Successive Approximation Register (SAR) |
| Abtastrate | 31 kSPS (max) |
| Conversion Time | 32 µs |
| Data Interface | Serial (NSC MICROWIRE / SPI-compatible) |
| Versorgungsspannung | 5 V DC typical (single supply) |
| Power Dissipation | 15 mW |
| Total Unadjusted Error | ±½ LSB (C-grade) / ±1 LSB |
| Input Type | Differential, Single-Ended |
| Gehäuse / Bauform | 14-SOIC (0.295 in / 7.50 mm width) |
| Montageart | Surface Mount |
| Lead-Free Option | Yes (NOPB suffix variant available) |
ADC0834CCWM Pin-Konfiguration
| Pin 1 | CS — Chip Select (active low) |
| Pin 2 | DI — Serial Data Input / MUX Address |
| Pin 3 | DO — Serial Data Output |
| Pin 4 | CLK — Serial Clock Input |
| Pin 5 | VCC — Analog +5 V Supply |
| Pin 6 | DGND — Digital Ground |
| Pin 7 | AGND — Analog Ground |
| Pin 8 | REF- — Reference Voltage Negative Input |
| Pin 9 | REF+ — Reference Voltage Positive Input |
| Pin 10 | CH0 — Analog Input Channel 0 |
| Pin 11 | CH1 — Analog Input Channel 1 |
| Pin 12 | CH2 — Analog Input Channel 2 |
| Pin 13 | CH3 — Analog Input Channel 3 |
| Pin 14 | NC — Not connected (per datasheet) |
Typische Anwendungen
ADC0834CCWM ist geeignet für 6 Anwendungs: Process Control Remote Digitizing, Transducer and Sensor Interface, Battery-Powered Portable Instrumentation, Isolated Serial Data Acquisition, Embedded MCU Companion ADC, Legacy Industrial Control Boards.
Process Control Remote Digitizing
The ADC0834CCWM's 4-channel MUX and MICROWIRE serial I/O make it ideal for remote process-control signal acquisition. The serial interface simplifies galvanic isolation between the field sensor and the host controller through optocouplers, allowing safe high-voltage measurements in industrial plants. With 32 µs conversion time and 15 mW dissipation, the part runs cool from a single 5 V rail, suiting long-lifetime installations. Engineers commonly pair it with a host microcontroller that issues MUX addresses and reads serialized conversion data; the differential input mode supports ratiometric measurements from bridge-type pressure and flow sensors. The 14-SOIC package is easy to hand-solder for maintenance.
Empfohlen
Transducer and Sensor Interface
For strain-gauge, thermistor, and thermocouple interfaces, the ADC0834CCWM provides 4 multiplexed differential inputs that connect directly to bridge-style sensors. Differential sampling rejects common-mode noise from motors and switching power supplies in industrial environments. According to the TI datasheet, the differential reference pins (REF+/REF-) allow ratiometric measurements where the ADC output scales with the excitation voltage, eliminating excitation drift errors. With 8-bit resolution and ±½ LSB INL, the converter delivers sufficient precision for HVAC, weigh-scale, and pressure-transducer modules. The 31 kSPS rate is more than adequate for slow-changing physical variables.
Empfohlen
Battery-Powered Portable Instrumentation
Drawing only 15 mW from a single 5 V rail, the ADC0834CCWM is well suited to battery-powered handheld instruments where power budget matters. The serial interface keeps pin count low (only 4 digital lines: CS, CLK, DI, DO), enabling compact PCB designs in handheld multimeters, environmental loggers, and portable medical monitors. The 4-channel MUX allows one ADC to read multiple sensors - battery voltage, temperature, current, and a transducer - reducing both BOM cost and PCB footprint. Power-down modes between conversions can be implemented by gating the serial clock, further extending battery life.
Empfohlen
Isolated Serial Data Acquisition
The ADC0834CCWM's MICROWIRE-compatible serial I/O simplifies opto-isolation for high-voltage or safety-isolated measurements. Only the 4-wire serial interface (CS, CLK, DI, DO) needs to cross the isolation barrier, which is more economical than isolating parallel ADC outputs. The 5 V single supply and TTL/MOS logic levels drive standard optocouplers directly without level shifters. According to TI application notes, the device supports remote digitizing over cable runs up to several meters when paired with slow-speed optocouplers. This topology is widely used in medical equipment, motor drives, and renewable-energy inverter monitoring.
Empfohlen
Embedded MCU Companion ADC
When an embedded microcontroller's internal ADC is insufficient - too few channels, wrong resolution, or slow - the ADC0834CCWM acts as an external companion ADC over SPI/MICROWIRE. The 4-channel MUX adds 4 extra analog inputs to a microcontroller that may have only 1 internal ADC. According to the TI datasheet, the simple serial protocol requires only a chip-select, clock, and data line - easy to implement in any MCU firmware. The 14-SOIC footprint fits easily next to QFP/QFN microcontrollers on 4-layer PCBs and the 8-bit resolution suits HVAC controls, appliance interfaces, and simple IoT sensor nodes.
Empfohlen
Legacy Industrial Control Boards
The ADC0834CCWM (and its /NOPB lead-free variant) is widely used as a form-fit-function replacement on legacy industrial control boards originally designed around the National Semiconductor ADC0834. The 14-SOIC footprint and pinout have not changed since the 1980s, allowing drop-in upgrades on existing PLCs, motor drives, and process controllers without PCB rework. Rochester Electronics stocks the part for long-term maintenance of installed systems in steel mills, chemical plants, and power-generation facilities. Engineers maintaining these systems rely on the ADC0834's stable, well-documented behavior and broad second-source availability.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für ADC0834CCWM – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | ADC0834CCWM/NOPB | ADC0834BCN/NOPB | ADC0831CCWM | ADC0834CCWM (ADI) | ADC0834CIWM |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices Inc | Texas Instruments |
| Package | 14-SOIC (7.50 mm) | 14-SOIC (7.50 mm) - same | 14-SOIC (7.50 mm) - same | 14-SOIC (7.50 mm) - same | 14-SOIC (7.50 mm) - same | 14-SOIC (7.50 mm) - same |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits |
| Input Channels | 4 (single-ended or differential) | 4 | 4 | 1 | 4 | 4 |
| Sampling Rate | 31 kSPS | 31 kSPS | 31 kSPS | 31 kSPS | 31 kSPS | 31 kSPS |
| Conversion Time | 32 µs | 32 µs | 32 µs | 32 µs | 32 µs | 32 µs |
| Total Unadjusted Error | ±½ LSB (C-grade) | ±½ LSB (C-grade) | ±1 LSB (B-grade) | ±½ LSB (C-grade) | ±½ LSB (C-grade) | ±½ LSB (industrial grade) |
| Lead-Free Finish | No (leaded) | Yes (Pb-free matte-tin) | Yes (Pb-free) | No (leaded) | No (legacy leaded) | No (leaded) |
| Supply Voltage | 5 V single | 5 V single | 5 V single | 5 V single | 5 V single | 5 V single |
Wichtigste Unterscheidungsmerkmale
- Industry-standard 4-channel SAR ADC with broad second-source availability (vs. ADC0831CCWM)
- Higher accuracy grade option in same footprint (vs. ADC0834BCN/NOPB)
- True cross-brand drop-in dual sourcing (vs. ADC0834CCWM (ADI))
- Pin-compatible with industrial temperature grade variant (vs. ADC0834CIWM)
Designhinweise
Place a 0.1 µF decoupling capacitor within 5 mm of the VCC pin (pin 5) and a 10 µF bulk capacitor on the same supply rail. Route the analog ground (AGND, pin 7) and digital ground (DGND, pin 6) as separate traces back to a single star-point ground near the regulator. This separation prevents digital switching noise from coupling into the analog conversion result. The REF+/REF- pins should be bypassed with a 0.1 µF ceramic capacitor to AGND to stabilize the reference voltage during conversions.
Keep the CLK trace short and routed away from the analog input traces. The serial clock frequency should be kept below the datasheet maximum (typically 400 kHz to 1 MHz depending on revision) to avoid digital feedthrough into the conversion. According to the TI ADC0834-N datasheet timing diagrams, the chip-select (CS) must be held low for the entire conversion sequence, and the MUX address is latched on the first 4 rising clock edges after CS goes low. Violating these timing relationships causes incorrect channel selection or lost data bits.
Do not leave the analog input channels floating when not in use - tie unused channels to mid-supply or AGND through 10 kΩ resistors to prevent crosstalk and excess supply current. Estimated: at 5 V supply, a floating input can draw up to 1 mA of leakage into the MUX. Also note that the ADC0834CCWM does NOT include an internal oscillator; the host MCU or CPLD must generate the I/O clock and chip-select sequence. A common mistake is treating the part as SPI-compatible without verifying the timing - it is MICROWIRE-compatible, which is similar but has a specific data setup/hold relationship.
The ADC0834CCWM draws approximately 3 mA quiescent current from a 5 V supply (15 mW dissipation). Estimated: idle current remains nearly constant whether converting or not, so power-down is achieved by gating the CLK pin and pulling CS high between conversions. For battery-powered designs, this reduces average supply current to the µA range when sampling at low rates. The supply voltage range is specified at 5 V typical; operation below 4.5 V reduces linearity and increases conversion time.
Compliance-Informationen
Base ADC0834CCWM uses leaded finish (non-RoHS); the /NOPB suffix variant is lead-free and RoHS-compliant. Not AEC-Q100 qualified - this is a commercial/industrial-grade part. Reach status confirmed via TI product page; halogen-free status not explicitly listed in the verified web data.
