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參數資料
| 型號： | TSC2046IZQCT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PBGA48 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, PLASTIC, VFBGA-48 |
| 文件頁數： | 33/33頁 |
| 文件大?。?/td> | 774K |
| 代理商： | TSC2046IZQCT |
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TSC2046
SBAS265G OCTOBER 2002 REVISED JANUARY 2008
www.ti.com
9
TYPICAL CHARACTERISTICS (continued)
At TA = +25°C, +VCC = +2.7V, IOVDD = +1.8V, VREF = External +2.5V, 12-bit mode, PD0 = 0, fSAMPLE = 125kHz, and fCLK = 16 fSAMPLE = 2MHz,
unless otherwise noted.
TEMP1 DIODE VOLTAGE vs +V
CC
2.7
3.0
3.3
+V
CC (V)
T
E
MP
1
D
iode
V
o
lt
age
(m
V
)
720
718
716
714
712
710
THEORY OF OPERATION
The TSC2046 is a classic successive approximation
register (SAR) analog-to-digital converter (ADC). The
architecture is based on capacitive redistribution, which
inherently includes a sample-and-hold function. The
converter is fabricated on a 0.6
m CMOS process.
The basic operation of the TSC2046 is shown in Figure 1.
The device features an internal 2.5V reference and uses
an external clock. Operation is maintained from a single
supply of 2.7V to 5.25V. The internal reference can be
overdriven with an external, low-impedance source
between 1V and +VCC. The value of the reference voltage
directly sets the input range of the converter.
The analog input (X-, Y-, and Z-Position coordinates,
auxiliary input, battery voltage, and chip temperature)
to the converter is provided via a multiplexer. A unique
configuration of low on-resistance touch panel driver
switches allows an unselected ADC input channel to
provide power and the accompanying pin to provide
ground for an external device, such as a touch screen.
By maintaining a differential input to the converter and
a differential reference architecture, it is possible to
negate the error from each touch panel driver switch
on-resistance (if this is a source of error for the
particular measurement).
+V
CC
+V
CC
X+
Y+
X
Y
V
BAT
AUX
B1
C1
D1
E1
G2
G3
G6
E7
G4
G5
A2
A3
A4
A5
A6
B7
C7
D7
DCLK
CS
DIN
BUSY
DOUT
PENIRQ
IOVDD
V
REF
Serial/Conversion Clock
Chip Select
Serial Data In
Converter Status
Serial Data Out
+
1
∝F
to
10
∝F
(Optional)
+2.7V to +5V
TSC2046
Auxiliary Input
To Battery
Voltage
Regulator
Touch
Screen
0.1
∝F
Pen Interrupt
GND
NOTE: VFBGA package and pin names shown.
Figure 1. Basic Operation of the TSC2046
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