Part A
ADS7807U
Техасские инструменты
- Lifecycle
- Active
- Stock
- 7038 ПКС
- Package
- SOIC-28
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Not a drop-in replacement
The ADS7807U and ADS7800KUG4 are both 12-bit successive-approximation ADCs, but they differ in resolution-critical architecture, package footprint, and interface timing, so the ADS7800KUG4 cannot be used as a direct drop-in substitute for the ADS7807U without a full board and firmware redesign.
Different package footprint
Different interface timing
Different reference architecture
Different supply configuration
Parts at a glance
Part B
ADS7800KUG4
Техасские инструменты
- Lifecycle
- Active
- Stock
- 2642 ПКС
- Package
- SOIC-24
- 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 | ADS7807U | ADS7800KUG4 | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 12 bit | Resolution determines the smallest analog signal change the ADC can distinguish; a 16-bit part offers 16x finer quantization than a 12-bit part, so they are not functionally interchangeable in precision applications. |
| Sampling Rate | 40 kSPS | 333 kSPS | Maximum throughput dictates the highest signal bandwidth the system can digitize; the ADS7800 is significantly faster, so substitution affects achievable sample rates. |
| Input Type | Single-ended | Single-ended | Input configuration must match the signal source topology; both are single-ended, so this aspect is compatible. |
| Supply Voltage | 5 V (single supply) | 5 V and -15 V (dual supply) | Supply requirements affect board-level power design; the ADS7800 needs a negative rail while the ADS7807 runs from a single 5 V supply, so power architecture must change. |
| Interface | Parallel (byte/word) | Parallel | Digital interface compatibility determines whether the part can drop into an existing microcontroller/FPGA bus without glue logic changes. |
| Package | 28-pin SOIC | 28-pin SOIC | Package footprint and pinout must match for physical substitutability; both use a 28-pin SOIC, easing board replacement. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range defines the environments where the part is guaranteed to meet specifications; matching ranges support use in the same industrial conditions. |
| Integral Nonlinearity (INL) | ±1.5 LSB (typ) | ±0.5 LSB (typ) | INL measures deviation from an ideal transfer function and directly impacts measurement accuracy; differing linearity affects system error budgets. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7807U | ADS7800KUG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 16 | 12 |
| Sampling Rate(Per Second) | 40k | 333k |
| 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 | Internal |
| Voltage - Supply, Analog | 5V | 5V, -11.4V ~ 16.5V |
| 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 ADS7800KUG4?
The ADS7807U is a 16-bit successive-approximation ADC with a parallel interface, while the ADS7800KUG4 is a 12-bit successive-approximation ADC with a parallel interface. The ADS7807U offers higher resolution (16-bit vs 12-bit) and is specified for a different package and temperature grade. Designers should compare resolution, sampling rate, package, and interface timing against their application requirements.
Do the ADS7807U and ADS7800KUG4 have the same package and pinout?
No. The ADS7807U is supplied in a 28-pin SOIC package, while the ADS7800KUG4 is supplied in a 28-pin SOIC package as well, but the two devices are not pin-compatible because their pin functions and control signals differ. A direct drop-in replacement is not possible without verifying pin functions and PCB layout against the respective datasheets.
What is the resolution and sampling rate of each device?
The ADS7807U provides 16-bit resolution with a maximum sampling rate of 40 kSPS. The ADS7800KUG4 provides 12-bit resolution with a maximum sampling rate of 333 kSPS. The higher sampling rate of the ADS7800KUG4 suits faster signal acquisition, while the ADS7807U targets higher-precision measurements.
Are the analog input ranges of the ADS7807U and ADS7800KUG4 the same?
No. The ADS7807U supports software-selectable input ranges of ±10 V, ±5 V, 0 to 10 V, and 0 to 5 V. The ADS7800KUG4 supports a ±10 V input range. The input range configuration must be matched to the signal conditioning circuitry when comparing or substituting these devices.
What digital interface do these ADCs use?
Both devices provide a parallel digital output interface. The ADS7807U outputs 16-bit parallel data, while the ADS7800KUG4 outputs 12-bit parallel data. The host processor or FPGA must be configured for the corresponding data bus width and control timing.
Can the ADS7800KUG4 be used as a substitute for the ADS7807U in an existing design?
No, not as a direct substitute. The ADS7800KUG4 has lower resolution (12-bit vs 16-bit), a different input range configuration, and different pin functions. Substitution requires redesign of the interface, signal conditioning, and PCB layout, and must be validated against both datasheets.
What are the operating temperature ranges for these devices?
The ADS7807U is specified over the industrial temperature range of −40°C to +85°C. The ADS7800KUG4 is specified over the industrial temperature range of −40°C to +85°C. Both devices are suitable for industrial-grade applications within these limits.
Which device is better suited for high-precision measurement applications?
The ADS7807U is better suited for high-precision measurement because it provides 16-bit resolution, offering finer quantization and lower LSB size than the 12-bit ADS7800KUG4. The ADS7800KUG4 is preferable when higher sampling rate and 12-bit resolution are sufficient for the application.