Overview
The AD1555AP, produced by Analog Devices Inc., is a 24-bit sigma-delta analog-to-digital converter (ADC) designed for low-frequency, high dynamic range measurement applications. This component combines a sigma-delta modulator with a programmable gain amplifier, making it ideal for systems requiring high precision and low noise. The AD1555AP is particularly suited for applications such as seismic data acquisition, chromatography, and automatic test equipment due to its robust inputs, high gain settings, and low power consumption.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Resolution | 24 | - | - | Bits |
| PGA Gain Settings | 1, 2.5, 8.5, 34, 128 | - | - | - |
| Input Range | -2.25 | - | - | V |
| Sampling Rate | - | 256 | - | kSPS |
| Dynamic Range | 116 | 120 | - | dB @ 1 ms |
| Input Noise | - | 80 nV rms @ 4 ms with Gain of 34,128 | - | - |
| Distortion | -111 | -120 | - | dB |
| Intermodulation | - | 122 | - | dB |
| Common-Mode Rejection | 93 | 101 | - | dB @ Gain of 1 |
| Power Dissipation | - | 77 mW | - | - |
| Operating Temperature | -55 | - | 85 | °C (B Grade) |
| Package Type | - | - | - | 28-lead PLCC |
Key Features
- Fourth-order sigma-delta modulator with large dynamic range (116 dB min, 120 dB typical @ 1 ms)
- Programmable gain front end with settings of 1, 2.5, 8.5, 34, and 128
- Low input noise: 80 nV rms @ 4 ms with gain of 34,128
- Low distortion and intermodulation: –111 dB max, –120 dB typical; 122 dB typical
- No external antialias filter required due to continuous-time analog modulator input architecture
- Low power dissipation: 77 mW typical, with standby modes
- Robust inputs and high common-mode rejection (93 dB min, 101 dB typical @ gain of 1)
- Fabricated on Analog Devices’ BiCMOS process
Applications
- Seismic data acquisition systems
- Chromatography
- Automatic test equipment
- Remote battery-powered data acquisition systems
Q & A
- What is the resolution of the AD1555AP?
The AD1555AP has a resolution of 24 bits. - What are the PGA gain settings available on the AD1555AP?
The PGA gain settings are 1, 2.5, 8.5, 34, and 128. - What is the input range of the AD1555AP?
The input range is ±2.25 V. - What is the sampling rate of the AD1555AP?
The sampling rate is up to 256 kSPS. - Does the AD1555AP require an external antialias filter?
No, it does not require an external antialias filter due to its continuous-time analog modulator input architecture. - What is the typical power dissipation of the AD1555AP?
The typical power dissipation is 77 mW. - What are the operating temperature ranges for the AD1555AP?
The operating temperature ranges are from –55°C to +85°C (B Grade) and from 0°C to +85°C (A Grade). - What package type is the AD1555AP available in?
The AD1555AP is available in a 28-lead PLCC package. - What are some common applications of the AD1555AP?
Common applications include seismic data acquisition systems, chromatography, and automatic test equipment. - Is the AD1555AP suitable for remote battery-powered systems?
