Part A
ADS5400IPZP
Texas Instruments
- Lifecycle
- Active
- Stock
- 7717 PCS
- Package
- HTQFP-100
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Not a drop-in replacement
The ADS5474IPFP and ADS5400IPZP are both 12-bit analog-to-digital converters, but they differ fundamentally in sampling rate, analog input bandwidth, package footprint, and power dissipation. The ADS5474IPFP delivers 400 MSPS in a TQFP-80 package, while the ADS5400IPZP provides 1 GSPS in a QFP-100 package with a different pinout and thermal profile. These differences in speed grade, footprint, and power architecture prevent direct board-level substitution without redesign of the analog front end, clocking, and power delivery.
Different sampling rate
Different package footprint
Different power dissipation
Different input bandwidth
Parts at a glance
Part B
ADS5474IPFP
Texas Instruments
- Lifecycle
- Active
- Stock
- 7275 PCS
- Package
- HTQFP-80
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | ADS5474IPFP | ADS5400IPZP | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 12 bit | Higher resolution provides finer quantization and better dynamic range; a 14-bit ADC offers 4x the code density of a 12-bit device, affecting SNR and measurement precision. |
| Sampling Rate | 400 MSPS | 1 GSPS | Maximum sample rate determines the input bandwidth and Nyquist zone the converter can support; the ADS5400 can digitize signals at more than twice the rate of the ADS5474. |
| Input Type | Differential | Differential | Both use differential inputs, which reject common-mode noise and improve distortion performance; matching input topology simplifies analog front-end design. |
| Output Interface | Parallel LVDS | Parallel LVDS | LVDS outputs provide low-noise, high-speed digital signaling; identical interface type eases FPGA/ASIC capture logic reuse between the two parts. |
| Supply Voltage | 3.3 V analog / 3.3 V digital | 3.3 V analog / 1.8 V digital | Different digital supply rails affect board power distribution and level shifting; the ADS5400 requires a separate 1.8 V digital rail while the ADS5474 uses 3.3 V. |
| Power Consumption | 2.2 W typical | 2.7 W typical | Power dissipation impacts thermal design and supply sizing; the higher-speed ADS5400 consumes more power, requiring more careful thermal management. |
| Package | 80-pin HTQFP (PFP) | 100-pin HTQFP (PZP) | Package footprint and pin count differ, so the two parts are not drop-in compatible and require different PCB layouts. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Industrial temperature range suitability is identical, so both can serve the same environmental conditions. |
| SNR | 69.5 dBFS (at 230 MHz input) | 57.5 dBFS (at 700 MHz input) | Signal-to-noise ratio indicates achievable dynamic range; the 14-bit ADS5474 delivers higher SNR, which matters for weak-signal detection. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS5400IPZP | ADS5474IPFP |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 12 | 14 |
| Sampling Rate(Per Second) | 1G | 400M |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Differential |
| Data Interface | LVDS - 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 | Pipelined | Pipelined |
| Reference Type | External, Internal | Internal |
| Voltage - Supply, Analog | 3.135V ~ 3.465V, 5V | 3.1V ~ 3.6V, 5V |
| Voltage - Supply, Digital | 3.135V ~ 3.465V | 3V ~ 3.6V |
| Features | Temperature Sensor | - |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the ADS5474IPFP and ADS5400IPZP analog-to-digital converters?
The ADS5474IPFP is a 14-bit, 400-MSPS ADC in a 100-pin HTQFP package, while the ADS5400IPZP is a 12-bit, 1-GSPS ADC in a 100-pin HTQFP package. The ADS5474 offers higher resolution at lower sample rate, whereas the ADS5400 provides higher sampling speed with lower resolution.
Are the ADS5474IPFP and ADS5400IPZP pin-compatible?
No. Although both devices are housed in a 100-pin HTQFP package, they are not pin-compatible. The pinout and functions differ between the two devices, so they cannot be interchanged on the same PCB without design changes.
What are the input signal specifications for the ADS5474IPFP?
The ADS5474IPFP features a differential input with a 2.2-Vpp full-scale range and an analog input bandwidth of approximately 1.2 GHz. It uses an internal sample-and-hold circuit and supports AC-coupled or DC-coupled differential input configurations.
What is the maximum sampling rate and resolution of the ADS5400IPZP?
The ADS5400IPZP is a 12-bit ADC with a maximum sampling rate of 1 GSPS (1000 MSPS). It is designed for high-speed digitization applications requiring wide instantaneous bandwidth.
What output interface do these ADCs use?
Both the ADS5474IPFP and ADS5400IPZP provide parallel LVDS-compatible output data. The ADS5474 outputs 14-bit data, while the ADS5400 outputs 12-bit data, both with accompanying data clock and frame clock signals for capture.
What are the typical power consumption figures for these devices?
The ADS5474IPFP typically dissipates approximately 2.2 W from a 5-V analog supply and 3.3-V digital supply. The ADS5400IPZP typically dissipates approximately 3.2 W from a 5-V analog supply and 3.3-V digital supply. Actual power depends on operating conditions and clock frequency.
Which device is better suited for wideband radar or test instrumentation applications?
The ADS5400IPZP, with its 1-GSPS sampling rate, supports wider instantaneous bandwidth and is generally preferred for wideband radar and high-speed instrumentation. The ADS5474IPFP, with 14-bit resolution at 400 MSPS, is better suited where higher dynamic range and resolution are prioritized over maximum sample rate.
What are the operating temperature ranges for the ADS5474IPFP and ADS5400IPZP?
Both devices are specified for the industrial temperature range of -40°C to +85°C (junction or case as defined in the respective datasheets). Designers should consult the manufacturer datasheets for exact thermal specifications and derating guidelines.