Overview
The AD1555BP from Analog Devices Inc. is a 24-bit sigma-delta analog-to-digital converter (ADC) designed for low-frequency, high dynamic range measurement applications. It combines a complete sigma-delta modulator with a programmable gain amplifier, making it ideal for systems requiring high precision and low noise. The AD1555BP outputs a ones-density bitstream proportional to the analog input and can be used in conjunction with the AD1556 digital filter/decimator to achieve high-performance ADC functionality. The device is fabricated on Analog Devices’ BiCMOS process, which integrates high-performance bipolar devices and CMOS transistors, and is packaged in a 28-lead PLCC package.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| PGA Gain Settings | - | 1, 2.5, 8.5, 34, 128 | - | - |
| Dynamic Range (PGA Gain of 1) | 116 dB | 120 dB | - | - |
| Total Harmonic Distortion (PGA Gain of 1) | -111 dB | -120 dB | - | - |
| Low Input Noise (at 4 ms with Gain of 34,128) | - | 80 nV rms | - | - |
| Sampling Rate | - | 256 kSPS | - | - |
| Common-Mode Rejection (DC to 1 kHz, Gain of 1) | 93 dB | 101 dB | - | - |
| Power Dissipation | - | 77 mW | - | - |
| Standby Power | - | 70 μW | - | - |
| Operating Temperature Range | -55°C to +85°C (B Grade) | - | 0°C to +85°C (A Grade) | - |
Key Features
- High dynamic range: up to 120 dB typical at 1 ms and 117 dB typical at 0.5 ms.
- Low input noise: 80 nV rms at 4 ms with a gain of 34,128.
- Low distortion and intermodulation: –111 dB max and –120 dB typical for THD, and 122 dB for intermodulation.
- Programmable gain front end with settings of 1, 2.5, 8.5, 34, and 128.
- No external antialias filter required due to continuous-time analog modulator input architecture.
- Very high jitter tolerance and robust inputs.
- Low operating power and standby modes, making it suitable for remote battery-powered data acquisition systems.
- Available in 28-lead PLCC package.
Applications
- Seismic data acquisition systems.
- Chromatography.
- Automatic test equipment.
Q & A
- What is the AD1555BP used for?
The AD1555BP is used for low-frequency, high dynamic range measurement applications, such as seismic data acquisition, chromatography, and automatic test equipment.
- What are the gain settings of the AD1555BP?
The AD1555BP has programmable gain settings of 1, 2.5, 8.5, 34, and 128.
- What is the dynamic range of the AD1555BP?
The dynamic range is up to 120 dB typical at 1 ms and 117 dB typical at 0.5 ms.
- Does the AD1555BP require an external antialias filter?
No, the AD1555BP does not require an external antialias filter due to its continuous-time analog modulator input architecture.
- What is the sampling rate of the AD1555BP?
The sampling rate is up to 256 kSPS.
- What is the power dissipation of the AD1555BP?
The typical power dissipation is 77 mW, with a standby power of 70 μW.
- What are the operating temperature ranges for the AD1555BP?
The operating temperature ranges are from –55°C to +85°C (B Grade) and from 0°C to +85°C (A Grade).
- In what package is the AD1555BP available?
The AD1555BP is available in a 28-lead PLCC package.
- What are the key benefits of using the AD1555BP in remote battery-powered systems?
The key benefits include low operating power, standby modes, and high dynamic range, making it ideal for remote battery-powered data acquisition systems.
- Can the AD1555BP be used with other components to enhance its functionality?
