ADS7870EA - 12-Bit, 52 kSPS ADC/MUX/PGA | Texas Instruments
MPN: ADS7870EA ✓ ActiveADS7870EA Overview
A data acquisition system combines analog signal conditioning and digital conversion on one integrated circuit. An ADC converts an analog voltage into a digital code, while a multiplexer selects among multiple sensor or measurement channels. The PGA applies gain before conversion, and the internal reference establishes a stable conversion scale. Together, these functions form a signal-conditioning chain within the broader ADC and data-converter IC category.
The ADS7870EA offers programmable gains of 1, 2, 4, 5, 8, 10, 16, and 20 V/V. It includes selectable 1.15 V, 2.048 V, and 2.5 V internal-reference options, allowing the converter and measurement system to be configured around different signal ranges. Its serial interface reduces the number of package pins required for communication with a controller.
At the center of the device is a 12-bit successive-approximation ADC. Conversion capability is rated at 52 kSPS, while the integrated multiplexing and gain control eliminate separate analog switches and external gain-stage circuitry in many designs. The architecture is intended for low-power control, portable instrumentation, and smart-sensor systems where component count and board area are important.
Typical uses include battery-powered measurement systems, industrial process monitoring, portable instrumentation, low-power control loops, and connected sensor nodes. The multiplexed input structure is particularly useful when several analog quantities must be measured with one controller. Differential operation can support sensing around a common-mode voltage, while single-ended operation increases the available channel count.
Designers should account for input settling time when changing channels or gain settings and should place reference and bypass capacitors according to the manufacturer’s recommended application circuit. Signal conditioning, input range, and reference selection should be evaluated together so that the selected full-scale range preserves useful ADC resolution without exceeding the analog input limits.
This page combines the manufacturer’s device description with engineering-focused application guidance, package information, sourcing questions, and a qualified comparison of same-footprint alternatives. It is intended to accelerate component selection while keeping footprint, interface, and conversion-rate constraints visible.
Drop-in alternatives for ADS7870EA — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
ADS7871
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7871IDBRG4
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7870EAG4
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1270BEAI+
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7844EG4
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7844NBG4
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7870EA Maximum Ratings & Electrical Characteristics
| ADC Resolution | 12 bit |
| Conversion Rate | 52 kSPS |
| ADC Architecture | Successive approximation (SAR) |
| Multiplexer Configuration | Up to 4 differential or 8 single-ended channels |
| Programmable PGA Gains | 1, 2, 4, 5, 8, 10, 16, and 20 V/V |
| Internal Reference Options | 1.15 V, 2.048 V, or 2.5 V |
| Digital Interface | Serial interface |
| Package | 28-pin SSOP |
| Mounting Type | Surface mount |
| Maximum Power Dissipation | 8.5 mW |
ADS7870EA 28-pin ssop Pin Configuration Guide
Pin configuration for ADS7870EA (28-pin ssop package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for ADS7870EA.
Refer to the datasheet for full pin configuration.
Typical Applications
ADS7870EA is suitable for 6 applications: Portable Battery-Powered Instrumentation, Industrial Process Monitoring, Smart Sensor Node, Low-Power Control System, Battery-Powered Sensor Interface, Precision Analog Test and Measurement.
Portable Battery-Powered Instrumentation
ADS7870EA fits portable measurement instruments that combine several low-power analog inputs with a compact controller. Its 12-bit, 52 kSPS SAR conversion rate supports continuous sampling of slowly varying sensor signals, while the reported 8.5 mW maximum power dissipation suits battery-operated equipment. The integrated four-channel differential or eight-channel single-ended multiplexer reduces external switching hardware, and PGA gains of 1 to 20 V/V adapt the front end to different sensor levels. Select a reference and gain combination that keeps signals below clipping while using enough of the ADC range to retain useful resolution.
Recommended
Industrial Process Monitoring
ADS7870EA is suitable for industrial process-monitoring boards that acquire several analog sensor outputs through one controller. The 4:8 multiplexer supports four differential or eight single-ended channels, allowing pressure, temperature, and position signals to share a compact conversion subsystem. Its 12-bit resolution and 52 kSPS throughput provide sufficient speed for many slow process variables, while the programmable PGA improves use of the conversion range. Keep analog traces short, provide proper grounding, and verify that each source remains within the selected gain and reference range.
Recommended
Smart Sensor Node
ADS7870EA fits connected sensor nodes that need multiple analog inputs, local gain adjustment, and a simple serial interface. The internal 1.15 V, 2.048 V, and 2.5 V reference options allow the node to avoid an external reference when suitable, while programmable gains from 1 to 20 V/V accommodate sensors with different output amplitudes. Its 52 kSPS rate supports periodic acquisition without requiring a high-rate standalone ADC. Firmware should configure the multiplexer and gain before conversion and allow the front end to settle after each channel or gain change.
Recommended
Low-Power Control System
ADS7870EA can serve as the measurement front end in a compact low-power control system. A controller can scan up to eight single-ended inputs or four differential inputs through the internal multiplexer and retrieve results through the serial interface. The 12-bit, 52 kSPS ADC is appropriate for many feedback and supervisory loops where the signal bandwidth is modest. Choose the PGA gain to maximize resolution without saturating the input, and apply the manufacturer’s settling requirements when the mux configuration changes between samples.
Recommended
Battery-Powered Sensor Interface
ADS7870EA is appropriate for battery-powered sensor interfaces where power, footprint, and channel count are tightly constrained. Integrating the multiplexer, PGA, ADC, and selectable internal reference into one 28-pin SSOP reduces the number of discrete support components. The 12-bit conversion resolution supports common temperature, pressure, and level measurements, while the 52 kSPS maximum rate permits faster sampling than many slow sensor outputs require. For duty-cycled systems, disable unused channels where supported and verify the complete acquisition sequence in the target power mode.
Recommended
Precision Analog Test and Measurement
ADS7870EA can support compact test and measurement products that digitize multiple low-level analog inputs. The PGA gains of 1, 2, 4, 5, 8, 10, 16, and 20 V/V allow small sensor outputs to occupy a larger portion of the 12-bit conversion range, improving measurement resolution without a discrete amplifier. Differential operation can reduce common-mode influence when the source and return paths are well matched. The 52 kSPS rate is appropriate for many instrumentation signals but should be compared with bandwidth and acquisition requirements of faster measurements.
Recommended
Recommended Products Summary
Engineering reference data for ADS7870EA — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS7871 | ADS7871IDBRG4 | ADS7870EAG4 | MAX1270BEAI+ | ADS7844EG4 |
|---|---|---|---|---|---|---|
| Package | 28-pin SSOP | 28-pin SSOP | 28-pin SSOP | 28-pin SSOP | 28-pin SSOP | 28-pin SSOP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Texas Instruments |
| ADC Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Digital Interface | Serial | Serial | Serial | Serial | Serial | Serial |
Key Differentiators
- Integrated eight-channel or four-channel acquisition front end (vs MAX1270BEAI+)
- Higher-rate upgrade within a documented compatible footprint (vs ADS7870EA)
- Same conversion function with a distinct qualification-oriented suffix (vs ADS7844EG4)
Design Notes
Do not treat a shared SSOP-28 footprint as proof of electrical or software equivalence. Before assigning ADS7871, ADS7844, or MAX1270BEAI+ to an ADS7870EA design, compare every pin function, supply limit, analog input range, reference configuration, acquisition timing, serial mode, and control-register behavior. The cross-manufacturer option is especially likely to require firmware changes even when the PCB outline is unchanged.
Allow the analog front end to settle after changing the mux channel, differential pairing, or PGA gain. Short input traces, a quiet ground connection, and placement of bypass and reference capacitors close to the device reduce acquisition error. For differential measurements, keep the positive and negative routes similarly routed and control leakage around high-impedance sensor outputs so that the 12-bit conversion is not limited by board-level pickup.
ADS7870EA has a reported maximum power dissipation of 8.5 mW, but actual system consumption also depends on supply voltage, conversion activity, reference use, and digital-interface loading. Estimate total dissipation from the selected operating mode and supply voltage, then confirm that the PCB provides adequate copper and that bypass capacitors meet the manufacturer’s recommended circuit. Avoid estimating thermal headroom from the maximum figure without the operating duty cycle.
Place decoupling and reference components according to the manufacturer’s recommended application diagram rather than distributing them around the board. Keep sensitive analog inputs away from serial clock and data traces, and provide a direct ground return for the device. When adapting an ADS7870EA board to another 28-pin DAS, preserve the footprint and pin-1 orientation but recheck every analog and reference net; mechanical compatibility alone does not establish functional compatibility.
Compliance Information
The manufacturer product materials identify the device as RoHS compliant in comparison content, but a product-specific declaration was not captured. Treat all remaining compliance fields as unknown until confirmed by the manufacturer or a current declaration document.