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參數(shù)資料
| 型號： | ADS-238Q |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 12-Bit, 20MHz, Low Power Sampling A/D Converters |
| 中文描述： | 12位，20MHz的，低功耗采樣A / D轉(zhuǎn)換器 |
| 文件頁數(shù)： | 2/7頁 |
| 文件大小： | 83K |
| 代理商： | ADS-238Q |
ADS-238Q
2
ABSOLUTE MAXIMUM RATINGS
PARAMETERS
LIMITS
UNITS
Supply Voltage, V
S
(Pins 4-9,44)
Input Voltages:
Analog Input, V
IN+
, V
IN–
(Pin 20, 21)
V
REF–
, V
REF+,
(Pin 10, 11)
CLK,
(Pin 2)
Lead Temperature
(10 seconds)
–0.5 to +6
Volts
–0.5 to (+V
S
+0.5)
–0.5 to (+V
S
+0.5)
–0.5 to (+V
S
+0.5)
+300
Volts
Volts
Volts
°C
FUNCTIONAL SPECIFICATIONS
(T
A
= T
MIN
to T
MAX
, V
S
= 3.3V, V
REF–
= 1.15V, V
REF+
= 2.15V, V
CM
= 1.65V, CLK
Frequency = 20MHz, BIAS1 = 90μA, BIAS2 = 9.5μA, Duty Cycle = 50% and
Differential Input, unless otherwise specified.)
ANALOG INPUTS
MIN.
TYP.
MAX.
UNITS
Differential Input Voltage Range
Common Mode Input Voltage
Input Capacitance
Input Bandwidth, Large Signal
±0.6
1.2
—
—
±1.0
1.65
1.4
120
±1.7
1.9
—
—
Volts
Volts
pF
MHz
DIGITAL INPUTS
Logic Levels
Logic "1"
Logic "0"
Logic Loading "1"
Logic Loading "0"
Input Capacitance
80% V
S
—
—
—
—
—
—
—
—
1.8
—
Volts
Volts
μA
μA
pF
20% V
S
±1
±1
—
REFERENCE VOLTAGES
Reference Input Voltage Range
(V
REF+
- V
REF–
)
Negative Reference Voltage
(V
REF–
)
Positive Reference Voltage
(V
REF+
)
Common Mode Output Voltage
(V
CM
)
0.6
1.0
1.7
Volts
—
1.15
—
Volts
—
2.15
—
Volts
1.3
1.65
1.8
Volts
STATIC PERFORMANCE
Resolution
Differential Nonlinearity
Integral Nonlinearity
Common Mode rejection ratio
No Missing Codes
Offset, Mid-Scale
Gain Error
—
—
—
—
12
—
—
12
±0.6
±3.0
55
—
±1.0
0.3
—
—
—
—
—
—
—
Bits
LSB
LSB
dB
Bits
%FSR
%
DYNAMIC PERFORMANCE
Peak Harmonics
F
IN
= 5MHz
F
IN
= 10MHz
Total Harmonics Distortion
F
IN
= 5MHz
F
IN
= 10MHz
Signal-to-Noise Ratio
(w/o distortion)
F
IN
= 5MHz
F
IN
= 10MHz
Signal-to-Noise Ratio
(and distortion)
F
IN
= 5MHz
F
IN
= 10MHz
Effective Number of Bits
F
IN
= 5MHz
F
IN
= 10MHz
62
—
70
61
—
—
dB
dB
—
—
–68
–60
–61
—
dB
dB
59
—
62
58
—
—
dB
dB
57
—
61
56
—
—
dB
dB
9.2
—
9.8
9.0
—
—
Bits
Bits
DYNAMIC PERFORMANCE
Differential Phase
Differential Gain
Aperature Uncertainty
Aperture Delay Time,
t
AP
Data Latency
A/D Conversion Rate
—
—
—
—
—
20
0.2
0.5
10
5
7.5
—
—
—
—
—
—
—
Degrees
%
ps rms
ns
Cycles
MHz
DIGITAL OUTPUTS
Logic "1"
Logic "0"
CLK to Output Delay Time, t
D
80% V
S
—
4
95% V
S
0.1
8
—
0.4
12
Volts
Volts
ns
POWER REQUIREMENTS
Supply Voltages, VS
Supply Current, I
S
Power Dissipation
Power Supply Rejection Ratio
2.8
—
—
—
3.3
24
79
63
3.6
30
100
—
Volts
mA
mW
dB
PHYSICAL/ENVIRONMENTAL
Operating Temp. Range, Case
Storage Temperature Range
Package Type
Weight
0
—
—
+70
+125
°C
°C
–65
44-pin (leaded), plastic thin quad flat package
0.2 grams
TECHNICAL NOTES
Differential Analog Input
The analog input is a fully differential input that can be
configured in various ways depending on whether a single-
ended or differential, AC or DC coupled input is required.
An AC coupled input is most readily implemented using a
transformer (1:1 with a center tap on the secondary
winding) as illustrated in Figures 2, Typical Connection
Diagram, and 3.1, Transformer Coupled Input. To minimize
distortion, the core of the transformer must not saturate at
full scale input voltage levels. To minimize kickback noise
from the internal sample-hold a small capacitor should be
connected across the V
IN
pins (pins 20 and 21).
Figure 3.2, DC Coupled Single Ended Input, illustrates a
conversion circuit for a DC coupled single-ended input.
Power supplies and by-pass capacitors are not shown.
Reference Voltage Inputs
The ADS-238Q is designed to accept two external
reference voltages at the V
REF
input pins, see Figure 2,
Typical Connection Diagram. These reference voltages,
applied to V
REF+
(pin 11) and V
REF–
(pin 10), determine the
analog input voltage range, which is equal to ±(V
REF+
-
V
REF–
). This voltage range will be symmetric about the
common mode voltage, and for best performance should
be symmetrical about the midpoint of the supply voltage.
In order to minimize overall converter noise it is
recommended that the V
REF
pins be adequately bypassed
using a 4.7μF tantalum capacitor in parallel with a 0.01μF
ceramic capacitor. Locate the bypass capacitors as close
to the unit as possible.
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