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MAX1220, MAX1257, MAX1258
12-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports
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Status
Active: In Production.
Description
The MAX1220/MAX1257/MAX1258 integrate a 12-bit, multichannel, analog-to-digital converter (ADC), and a 12-bit, octal, digital-to-analog converter (DAC) in a single IC. These devices also include a temperature sensor and configurable general-purpose I/O ports (GPIOs) with a 25MHz SPI™-/QSPI™-/MICROWIRE™-compatible serial interface. The ADC is available in 8 and 16 input-channel versions. The octal DAC outputs settle within 2.0µs and the ADC has a 225ksps conversion rate.
All devices include an internal reference (2.5V or 4.096V) for both the ADC and DAC. Programmable reference modes allow the use of an internal reference, an
external reference, or a combination of both. Features such as an internal ±1°C accurate temperature sensor, FIFO, scan modes, programmable internal or external clock modes, data averaging, and AutoShutdown™ allow users to minimize power consumption and processor requirements. The low glitch energy (4nV × s) and low digital feedthrough (0.5nV × s) of the integrated octal DACs make these devices ideal for digital control of fast-response closed-loop systems.
The devices are guaranteed to operate with a supply voltage from +2.7V to +3.6V (MAX1257) and from +4.75V to +5.25V (MAX1220/MAX1258). These devices consume 2.5mA at 225ksps throughput, only 22µA at 1ksp throughput, and under 0.2µA in the shutdown mode. The MAX1257/MAX1258 feature 12 GPIOs, while the MAX1220 offers four GPIOs that can be configured as inputs or outputs.
The MAX1220 is available in a 36-pin thin QFN package. The MAX1257/MAX1258 are available in 48-pin thin QFN package. All devices are specified over the -40°C to +85°C temperature range.
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Data Sheet
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An evaluation kit is available: MAX1258EVC16, MAX1258EVKIT
Key Features
- 12-Bit, 225ksps ADC
- Analog Multiplexer with True-Differential Track/Hold (T/H)
- 16 Single-Ended Channels or 8 Differential Channels (Unipolar or Bipolar) (MAX1257/MAX1258)
- Eight Single-Ended Channels or Four Differential Channels (Unipolar or Bipolar) (MAX1220)
- Excellent Accuracy: ±0.5 LSB INL, ±0.5 LSB DNL
- 12-Bit, Octal, 2µs Settling DAC
- Ultra-Low Glitch Energy (4nV × s)
- Power-Up Options from Zero Scale or Full Scale
- Excellent Accuracy: ±0.5 LSB INL
- Internal Reference or External Single-Ended/Differential Reference
- Internal Reference Voltage 2.5V or 4.096V
- Internal ±1°C Accurate Temperature Sensor
- On-Chip FIFO Capable of Storing 16 ADC Conversion Results and One Temperature Result
- On-Chip Channel-Scan Mode and Internal Data-Averaging Features
- Analog Single-Supply Operation
- +2.7V to +3.6V or +4.75V to +5.25V
- Digital Supply: +2.7V to AVDD
- 25MHz, SPI/QSPI/MICROWIRE Serial Interface
- AutoShutdown Between Conversions
- Low-Power ADC
- 2.5mA at 225ksps
- 22µA at 1ksps
- 0.2µA at Shutdown
- Low-Power DAC: 1.5mA
- Evaluation Kit Available (Order MAX1258EVKIT)
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Applications/Uses
- Base-Station Control Loops
- Controls for Optical Components
- Data Acquisition Systems
- System Supervision and Control
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Key Specifications:
| Precision ADCs (< 5Msps) |
| Part Number |
Resolution
(bits) |
Input Chan. |
Conv. Rate
(ksps) |
Data Bus
(bits) |
Diff/S.E. Input |
Internal VREF
(V) |
External VREF
(V) |
External VREF
(V) |
Unipolar VIN
(V) |
Bipolar VIN
(±V) |
SNR
(dB) |
SINAD
(dB) |
THD
(dB) |
SFDR
(dB) |
DNL
(±LSB) |
INL
(±LSB) |
Package/Pins |
Budgetary Price |
| ADC |
max |
nominal |
min |
max |
max |
max |
See Notes |
| MAX1220 |
12 |
8 |
300 |
SPI |
Both |
4.096 |
1 |
5.25 |
4.096 |
2.048 |
70 |
70 |
-76 |
72 |
0.5 |
0.5 |
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$13.79 @1k |
| MAX1257 |
16 |
2.5 |
3.6 |
2.5 |
1.25 |
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$14.49 @1k |
| MAX1258 |
16 |
4.096 |
5.25 |
4.096 |
2.048 |
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$14.49 @1k |
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See All Precision ADCs (< 5Msps) (417)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Pin Configuration
Didn't Find What You Need?
Information Index
Document Ref.: 19-3295
Rev 6;
2010-01-18
This page last modified: 2010-09-09
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