Part A
ADC0832CCN
Техасские инструменты
- Lifecycle
- Active
- Stock
- 5986 ПКС
- Package
- PDIP-8
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Not a drop-in replacement
The ADC0832CCN and ADC0820CCN are both 8-bit analog-to-digital converters in DIP-8 packages, but they differ fundamentally in serial versus parallel interface architecture, conversion timing, and reference configuration. The ADC0832CCN cannot serve as a direct drop-in substitute for the ADC0820CCN without redesigning the host interface, timing, and supporting circuitry.
Different interface type
Different conversion architecture
Different reference configuration
Different timing requirements
Parts at a glance
Part B
ADC0820CCN
Техасские инструменты
- Lifecycle
- Active
- Stock
- 8646 ПКС
- Package
- DIP-20
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADC0832CCN | ADC0820CCN | Why it matters |
|---|---|---|---|
| Resolution | 8 bits | 8 bits | Both are 8-bit converters, so quantization step size is equivalent for a given reference voltage. |
| Architecture / Conversion Method | Successive approximation (SAR) | Half-flash (2-step flash) | Architecture determines conversion speed, latency, and how the part is clocked and controlled in a system. |
| Number of Input Channels | 2 single-ended / 1 differential | 1 single-ended | Channel count affects whether the part can multiplex multiple signals or measure differential inputs without external circuitry. |
| Interface Type | Serial (Microwire/SPI-compatible) | Parallel (8-bit) | Serial vs parallel interface changes pin count, board routing, and the host microcontroller port requirements. |
| Conversion Time | ~32 µs (at 250 kHz clock) | ~1.5 µs (typical) | Conversion time sets the maximum sampling rate and suitability for fast-changing or multiplexed signals. |
| Supply Voltage Range | 4.5 V to 6.3 V (5 V nominal) | 4.5 V to 5.5 V (5 V nominal) | Supply range determines compatibility with the system rail and tolerance to variation. |
| Package | 8-pin DIP (N) | 20-pin DIP (N) | Package and pin count affect PCB footprint and whether a drop-in replacement is physically possible. |
| Reference Input | External VREF (with VCC/2 option) | External VREF | Reference configuration sets the input voltage span and full-scale accuracy of the conversion. |
| Operating Temperature Range | 0 °C to +70 °C (commercial) | 0 °C to +70 °C (commercial) | Temperature range confirms suitability for the intended environment and matches grade expectations. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADC0832CCN | ADC0820CCN |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Texas Instruments |
| Part Status | Obsolete | Obsolete |
| Number of Bits | 8 | 8 |
| Number of Inputs | 2 | 1 |
| Input Type | Differential, Pseudo-Differential, Single Ended | Pseudo-Differential, Single Ended |
| Data Interface | SPI | Parallel |
| Configuration | MUX-ADC | S/H-ADC |
| Ratio - S / H: ADC | - | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | Flash |
| Reference Type | External | External |
| Voltage - Supply, Analog | 4.5V ~ 6.3V | 4.5V ~ 8V |
| Voltage - Supply, Digital | 4.5V ~ 6.3V | 4.5V ~ 8V |
| Operating Temperature | -40°C ~ 85°C | 0°C ~ 70°C |
| Sampling Rate(Per Second) | 31.25k | - |
Frequently asked questions
What are the key architectural differences between the ADC0832CCN and ADC0820CCN?
The ADC0832CCN is an 8-bit successive-approximation ADC with a 2-channel multiplexer and serial (Microwire/SPI-compatible) output, housed in an 8-pin DIP. The ADC0820CCN is an 8-bit flash (half-flash) ADC with a single analog input and parallel 8-bit tri-state output, housed in a 20-pin DIP. The ADC0832 performs a bit-by-bit SAR conversion, while the ADC0820 uses a two-step flash architecture for faster conversion.
How do the conversion times of the ADC0832CCN and ADC0820CCN compare?
The ADC0832CCN has a typical conversion time of approximately 32 microseconds (at a 250 kHz clock). The ADC0820CCN is significantly faster, with a typical conversion time of approximately 1.5 to 2.5 microseconds. The ADC0820 is therefore better suited for higher-speed sampling applications, while the ADC0832 is adequate for lower-speed monitoring and control tasks.
Are the ADC0832CCN and ADC0820CCN pin-compatible or interchangeable?
No. The ADC0832CCN is an 8-pin device (DIP-8), while the ADC0820CCN is a 20-pin device (DIP-20). They have different pin counts, pin functions, and package footprints, so they cannot be directly substituted on the same PCB without a redesign. The ADC0832 uses serial data output, whereas the ADC0820 provides parallel data output.
What are the input configurations of the ADC0832CCN and ADC0820CCN?
The ADC0832CCN features a 2-channel analog multiplexer that can be configured for single-ended inputs on either channel or a differential input between the two channels. The ADC0820CCN has a single analog input channel (with a second input pin for reference/offset adjustment in some configurations) and does not include an input multiplexer. The ADC0832 offers more flexibility for multi-signal acquisition.
How do the digital interfaces of the ADC0832CCN and ADC0820CCN differ?
The ADC0832CCN uses a serial interface compatible with Microwire and SPI protocols, requiring chip select, clock, and data I/O lines. The ADC0820CCN provides a parallel 8-bit tri-state output bus with control signals for read and write (start conversion), making it suitable for direct connection to a microprocessor data bus. The interface choice affects board layout, pin count, and microcontroller selection.
What are the typical supply voltage and power consumption specifications for these devices?
Both the ADC0832CCN and ADC0820CCN operate from a single 5 V supply. The ADC0832CCN typically consumes about 15 mW at 5 V. The ADC0820CCN typically consumes approximately 75 mW at 5 V. The ADC0832 is therefore more power-efficient, which can be advantageous in battery-powered or thermally constrained designs.
Which device is better suited for high-speed sampling applications?
The ADC0820CCN is better suited for high-speed sampling due to its flash-based architecture and conversion time of approximately 1.5 to 2.5 microseconds, supporting sampling rates up to roughly 400 kSPS. The ADC0832CCN, with a conversion time of about 32 microseconds, supports sampling rates on the order of tens of kSPS and is intended for lower-speed applications such as sensor monitoring and control loops.