Part A
ADS7807U
德州儀器
- Lifecycle
- Active
- Stock
- 7038 件
- Package
- SOIC-28
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADS7804UB is a viable functional replacement candidate for the ADS7807U, sharing the same 12-bit SAR architecture, 5V single-supply operation, and 28-pin SOIC footprint. Designers should validate the tighter INL specification, the faster 10 µs conversion time, and the corresponding maximum throughput before substituting in existing sockets.
Resolution and Architecture
High match
Package and Pinout
High match
Supply Voltage
High match
Conversion Time and Throughput
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS7807U | ADS7804UB | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 12 bit | Resolution determines the smallest analog signal change the ADC can distinguish; a 16-bit device provides 16x finer quantization than a 12-bit device, directly affecting measurement precision and substitutability. |
| Sampling Rate | 40 kSPS | 100 kSPS | Maximum throughput limits the bandwidth of signals that can be digitized; the ADS7804UB supports faster sampling, which matters for higher-frequency or multiplexed acquisition systems. |
| Input Type | Single-ended | Single-ended | Input configuration determines how the analog source connects; both are single-ended, so the same signal conditioning topology can generally be reused. |
| Supply Voltage | 5 V | 5 V | Supply voltage must match the system rail; both operate from a single 5 V supply, simplifying power-rail compatibility in substitution. |
| Interface | Parallel | Parallel | The digital interface must match the host controller; both use a parallel interface, so bus timing and pinout compatibility are the key concerns. |
| Package | 28-SOIC | 28-SOIC | Package and pinout determine board-level drop-in compatibility; identical SOIC-28 packages allow the same footprint to be reused. |
| INL (Integral Nonlinearity) | ±2 LSB (typ) | ±0.5 LSB (typ) | INL describes deviation from an ideal transfer function; lower INL yields better absolute accuracy, and the difference here reflects the resolution and grade differences between the parts. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range must cover the application environment; matching industrial ranges means both parts are suitable for the same operating conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7807U | ADS7804UB |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Active |
| Number of Bits | 16 | 12 |
| Sampling Rate(Per Second) | 40k | 100k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, Parallel | Parallel |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the ADS7807U and ADS7804UB?
The ADS7807U is a 16-bit successive-approximation ADC, while the ADS7804UB is a 12-bit successive-approximation ADC. Both are pin-compatible in the same 28-pin SOIC package and share the same analog input range and sampling architecture, but they differ in resolution, integral nonlinearity, and dynamic performance specifications.
Are the ADS7807U and ADS7804UB pin-compatible?
Yes. Both devices are offered in a 28-pin SOIC (DW) package with the same pinout, allowing the ADS7804UB to be used as a drop-in replacement for the ADS7807U on an existing PCB layout, provided the system resolution requirements are met.
What is the resolution and sampling rate of each device?
The ADS7807U provides 16-bit resolution with a 40 kSPS maximum sampling rate. The ADS7804UB provides 12-bit resolution with a 100 kSPS maximum sampling rate. The higher sampling rate of the ADS7804UB comes at the cost of lower resolution.
Do both parts support the same analog input range?
Yes. Both the ADS7807U and ADS7804UB accept a bipolar ±10 V analog input range and include an on-chip sample-and-hold amplifier, allowing direct interfacing with industrial-level signals without external signal conditioning.
What digital interface do the ADS7807U and ADS7804UB use?
Both devices provide a parallel digital output interface with a standard microprocessor-compatible bus, including chip select, read, and convert start control lines. The ADS7807U outputs 16 data bits, while the ADS7804UB outputs 12 data bits on the parallel bus.
How do the linearity specifications compare between the two parts?
The ADS7807U specifies ±2 LSB maximum integral nonlinearity (INL) at 16-bit resolution, while the ADS7804UB specifies ±0.5 LSB maximum INL at 12-bit resolution. The tighter LSB-referenced INL of the ADS7804UB reflects its lower resolution and different accuracy grade.
Can the ADS7804UB replace the ADS7807U in an existing design?
It can be considered only if the system can tolerate a reduction from 16-bit to 12-bit resolution and the associated loss of dynamic range and accuracy. The pinout and analog input range are compatible, but the firmware or FPGA data capture logic must be updated to handle 12-bit instead of 16-bit conversion results.
What are the typical power supply requirements for these ADCs?
Both the ADS7807U and ADS7804UB operate from a single +5 V analog supply and a +5 V digital supply, with typical power dissipation in the range of 100 mW. They also require an external reference voltage for full-scale calibration, consistent with the ADS780x family architecture.