Texas Instruments TLC549IP, TLC549IDR, TLC549ID, TLC549CP, TLC549CDR Datasheet
...
TLC548C, TLC548I, TLC549C, TLC549I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL
SLAS067C – NOVEMBER 1983 – REVISED SEPTEMBER 1996
D
Microprocessor Peripheral or Standalone
Operation
D
8-Bit Resolution A/D Converter
D
Differential Reference Input Voltages
D
Conversion Time ...17 µs Max
D
Total Access and Conversion Cycles Per
Second
– TLC548...up to 45500
– TLC549...up to 40000
D
On-Chip Software-Controllable
Sample-and-Hold Function
D
Total Unadjusted Error...±0.5 LSB Max
D
4-MHz Typical Internal System Clock
D
Wide Supply Range...3 V to 6 V
D
Low Power Consumption...15 mW Max
D
Ideal for Cost-Effective, High-Performance
Applications including Battery-Operated
Portable Instrumentation
D
Pinout and Control Signals Compatible
With the TLC540 and TLC545 8-Bit A/D
Converters and with the TLC1540 10-Bit
A/D Converter
D
CMOS Technology
description
REF+
ANALOG IN
REF–
GND
D OR P PACKAGE
(TOP VIEW)
1
2
3
4
V
8
I/O CLOCK
7
DATA OUT
6
CS
5
CC
The TLC548 and TLC549 are CMOS analog-to-digital converter (ADC) integrated circuits built around an 8-bit
switched-capacitor successive-approximation ADC. These devices are designed for serial interface with a
microprocessor or peripheral through a 3-state data output and an analog input. The TLC548 and TLC549 use
only the input/output clock (I/O CLOCK) input along with the chip select (CS
) input for data control. The
maximum I/O CLOCK input frequency of the TLC548 is 2.048 MHz, and the I/O CLOCK input frequency of the
TLC549 is specified up to 1.1 MHz.
AVAILABLE OPTIONS
PACKAGE
T
A
0°C to 70°C
–40°C to 85°C
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SMALL OUTLINE
(D)
TLC548CD
TLC549CD
TLC548ID
TLC549ID
PLASTIC DIP
(P)
TLC548CP
TLC549CP
TLC548IP
TLC549IP
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 1996, Texas Instruments Incorporated
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TLC548C, TLC548I, TLC549C, TLC549I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL
SLAS067C – NOVEMBER 1983 – REVISED SEPTEMBER 1996
description (continued)
Operation of the TLC548 and the TLC549 is very similar to that of the more complex TLC540 and TLC541
devices; however, the TLC548 and TLC549 provide an on-chip system clock that operates typically at 4 MHz
and requires no external components. The on-chip system clock allows internal device operation to proceed
independently of serial input/output data timing and permits manipulation of the TLC548 and TLC549 as desired
for a wide range of software and hardware requirements. The I/O CLOCK together with the internal system clock
allow high-speed data transfer and conversion rates of 45 500 conversions per second for the TLC548, and
40 000 conversions per second for the TLC549.
Additional TLC548 and TLC549 features include versatile control logic, an on-chip sample-and-hold circuit that
can operate automatically or under microprocessor control, and a high-speed converter with differential
high-impedance reference voltage inputs that ease ratiometric conversion, scaling, and circuit isolation from
logic and supply noises. Design of the totally switched-capacitor successive-approximation converter circuit
allows conversion with a maximum total error of ±0.5 least significant bit (LSB) in less than 17 µs.
The TLC548C and TLC549C are characterized for operation from 0°C to 70°C. The TLC548I and TLC549I are
characterized for operation from –40°C to 85°C.
functional block diagram
CS
1
3
2
5
7
Sample
and
Hold
REF+
REF–
ANALOG IN
I/O CLOCK
typical equivalent inputs
INPUT CIRCUIT IMPEDANCE DURING SAMPLING MODE INPUT CIRCUIT IMPEDANCE DURING HOLD MODE
1 kΩ TYP
ANALOG IN
Internal
System
Clock
Ci = 60 pF TYP
(equivalent input
capacitance)
8-Bit
Analog-to
Digital
Converter
(Switched-
Capacitors)
Control
Logic and
Output Counter
8
Output
Data
Regiser
ANALOG IN
8
4
8-to-1 Data
Selector
and
Driver
5 MΩ TYP
6
DATA
OUT
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
operating sequence
TLC548C, TLC548I, TLC549C, TLC549I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL
SLAS067C – NOVEMBER 1983 – REVISED SEPTEMBER 1996
88765432765432
A7
MSBLSB
Don’t
t
conv
(see Note A)
Hi-Z State
I/O
CLOCK
t
su(CS)
CS
DATA
OUT
t
en
NOTES: A. The conversion cycle, which requires 36 internal system clock periods (17 µs maximum), is initiated with the eighth I/O clock pulse
trailing edge after CS
B. The most significant bit (A7) is automatically placed on the DAT A OUT bus after CS
are clocked out on the first seven I/O clock falling edges. B7–B0 follows in the same manner.
Access
Cycle B
A7 A6 A5 A4 A3 A2 A1 A0
MSB
(see Note B)
Previous Conversion Data A
goes low for the channel whose address exists in memory at the time.
Sample
Cycle B
t
wH(CS)
Care
t
en
11
Access
Cycle C
t
su(CS)
Conversion Data B
is brought low. The remaining seven bits (A6–A0)
Sample
Cycle C
Hi-Z State
B0B1B2B3B4B5B6B7
B7
MSBMSB LSB
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC (see Note 1) 6.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range at any input –0.3 V to V
Output voltage range –0.3 V to V
Peak input current range (any input) ±10 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Peak total input current range (all inputs) ±30 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
(see Note 2): TLC548C, TLC549C 0°C to 70°C. . . . . . . . . . . . .
A
TLC548I, TLC549I –40°C to 85°C. . . . . . . . . . . .
Storage temperature range, T
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NOTES: 1. All voltage values are with respect to the network ground terminal with the REF– and GND terminals connected together, unless
otherwise noted.
2. The D package is not recommended below –40°C.
CC
CC
+ 0.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
+ 0.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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