ADC78H90 Datasheet, PDF (1/23 Pages) National Semiconductor (TI) – 8-Channel, 500 kSPS, 12-Bit A/D Converter

ADC78H90
www.ti.com
SNAS227D – NOVEMBER 2003 – REVISED MARCH 2013
ADC78H90 8-Channel, 500 kSPS, 12-Bit A/D Converter
Check for Samples: ADC78H90
FEATURES
1
•2 Eight input channels
• Variable power management
• Independent analog and digital supplies
• SPI™/QSPI™/MICROWIRE™/DSP compatible
• Packaged in 16-lead TSSOP
APPLICATIONS
• Automotive Navigation
• Portable Systems
• Medical Instruments
• Mobile Communications
• Instrumentation and Control Systems
KEY SPECIFICATIONS
• Conversion Rate: 500kSPS
• DNL: ± 1LSB (max)
• INL: ± 1LSB (max)
• Power Consumption
– 3V Supply: 1.5 mW (typ)
– 5V Supply: 8.3 mW (typ)
DESCRIPTION
The ADC78H90 is a low-power, eight-channel CMOS
12-bit analog-to-digital converter with a conversion
throughput of 500 kSPS. The converter is based on a
successive-approximation register architecture with
an internal track-and-hold circuit. It can be configured
to accept up to eight input signals at inputs AIN1
through AIN8.
The output serial data is straight binary, and is
compatible with several standards, such as SPI™,
QSPI™, MICROWIRE™, and many common DSP
serial interfaces.
The ADC78H90 may be operated with independent
analog and digital supplies. The analog supply (AV_DD)
can range from +2.7V to +5.25V, and the digital
supply (DV_DD) can range from +2.7V to AV_DD. Normal
power consumption using a +3V or +5V supply is 1.5
mW and 8.3 mW, respectively. The power-down
feature reduces the power consumption to just 0.3
µW using a +3V supply, or 0.5 µW using a +5V
supply.
The ADC78H90 is packaged in a 16-lead TSSOP
package. Operation over the industrial temperature
range of −40°C to +85°C is ensured.
Connection Diagram
CS 1
AV _DD 2
AGND 3
AIN1 4
AIN2 5
AIN3 6
AIN4 7
AIN5 8
16
15
14
13
ADC78H90
12
11
10
9
SCLK
DOUT
DIN
DV _DD
DGND
AIN8
AIN7
AIN6
Figure 1. 16-Lead TSSOP
See PW Package
Block Diagram
AIN1
.
.
.
AIN8
MUX
T/H
AGND
ADC78H90
12-BIT
SUCCESSIVE
APPROXIMATION
ADC
AV_DD
AGND
CONTROL
LOGIC
DV_DD
SCLK
CS
DIN
DOUT
DGND
PIN DESCRIPTIONS AND EQUIVALENT CIRCUITS
Pin
No.
Symbol
Equivalent
Circuit
Description
ANALOG I/O
4 - AIN1 to
11 AIN8
DIGITAL I/O
Analog inputs. These signals
can range from 0V to AV_DD.
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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