ADS-325A Datel, Inc., ADS-325A Datasheet - Page 2

• Manufacturer Part Number: ADS-325A
• Description: 10-Bit,20MHz, Sampling A/D Converter
• Manufacturer: Datel, Inc.

ADS-325A
ABSOLUTE MAXIMUM RATINGS (T
FUNCTIONAL SPECIFICATIONS
(Typical at f
and T
ANALOG INPUTS
Input Voltage Range, V
Input Current
Capacitance, C
Bandwidth (–1dB)
REFERENCE
Reference Input Voltage
Input Current
Offset Voltage
Resistance (V
DIGITAL INPUTS
Input Voltage
Input Current
A/D Clock Pulse Width
DIGITAL OUTPUTS
Output Logic Current
Leak Current at OE = "1"
3-State Enable Time, T
3-State Disable Time, T
Data Delay, T
PERFORMANCE
Resolution
Max. Throughput Rate
Min. Throughput Rate
Integral Linearity Error
Differential Linearity Error
Differential Gain Error
Differential Phase Error
Aperture Delay, Tsd
SNR & Distortion
PARAMETERS
Supply Voltages (+AV
Reference Voltage (V
Input Voltage, Analog (V
Input Voltage, Digital (V
Output Voltage, Digital (V
V
V
V
V
I
I
V
V
V
V
I
I
T
T
f
f
f
f
f
f
RT
RB
IH
IL
IN
IN
IN
IN
IN
IN
I
I
IN
IN
RT
RB
RT
RB
IH,
IL,
PW1
PW0
OH,
OL,
, Logic Loading "0"
, Logic Loading "1"
= 100kHz
= 500kHz
= 1MHz
= 3MHz
= 7MHz
= 10MHz
A
= +4V
= +2V
Logic "0"
Logic "1"
Logic "0"
Logic "1"
= +25°C unless otherwise specified.)
S
= 20MHz, +AV
DL
RT
IN
(C
– V
L
= 20pF)
RB
RT
S
)
PZE
IN
PEZ
and +DV
and V
IH
IN
OH
and V
)
and V
S
RB
= +5V, +DV
IL
)
S
)
)
OL
)
MIN.
–120
+1.8
+2.3
–50
–11
+40
180
—
—
—
—
—
—
—
25
25
10
20
10
20
—
—
—
—
—
—
—
—
—
—
—
5
–3.5
8
2
3.5
—
S
–0.5 to +DV
–0.5 to +AV
–0.5 to +AV
–0.5 to +AV
= +3.3V, V
+2 to +4
LIMITS
0 to +7
TYP.
±1.3
±0.5
–40
+90
–70
280
1.0
0.3
+4
+2
40
70
–7
—
—
—
—
—
—
15
25
13
—
—
—
53
52
53
54
47
45
9
7
4
—
—
—
A
S
S
S
S
RB
= +25°C)
+0.5
+0.5
+0.5
+0.5
= +2.0V, V
MAX.
+140
+4.6
+0.8
–20
380
0.5
50
—
—
—
—
11
–5
—
—
—
20
30
18
—
—
±2
±1
—
—
—
—
—
—
—
—
5
5
6
—
—
1
UNITS
RT
Volts
Volts
Volts
Volts
Volts
Degrees
UNITS
= +4.0V,
Volts
MHz
Volts
Volts
Volts
Volts
MHz
MHz
LSB
LSB
Bits
mA
mA
mV
mV
mA
mA
µA
µA
µA
µA
µA
dB
dB
dB
dB
dB
dB
pF
ns
ns
ns
ns
ns
ns
%
2
TECHNICAL NOTES
1. Caution to ESD: Since the ADS-325A is a CMOS device,
2. +AV
3. PC board layout: To obtain fully specified performance
4. Reference Input: Two external voltage references are
PERFORMANCE (CONT.)
Spurious Free Dynamic Range
POWER REQUIREMENTS
Power Supply Voltage
Supply Current
Standby Current (CE = "1")
Power Dissipation
PHYSICAL/ENVIRONMENTAL
Operating Temperature Range
Storage Temperature Range
Weight
Package
Footnotes:
f
f
f
f
f
f
IN
IN
IN
IN
IN
IN
+AV
+DV
|DGND – AGND |
Analog, +AI
Digital, +DI
Analog, +AI
Digital, +DI
precautions against static electricity should be taken.
the analog supply (+AV
time skew between supplying (or removing) both +AV
+DV
using a common power supply for both +AV
avoid latch-up conditions. It is possible to use +3.3V for
+DV
supply application, there will be no significant difference in
performance. However, special care should be taken to
minimize the time skew between +AV
turning on/off.
careful attention to PC board layout is required. Place large
ground planes on the board and connect both analog and
digital grounds at one point right beneath the converter. In
the case where the grounds are tied at a location distant
from the converter, the voltage difference between the
grounds must be within 100mV. Tie all ground pins directly
to the appropriate ground plane beneath the converter.
Bypass +AV
tantalum capacitors in parallel with 0.1µF ceramic
capacitors at locations as close to the unit as possible.
required for the two reference inputs VRT (pin 29, 30) and
VRB (pin 34, 35). Typically, these are +4V for VRT and +2V
+DV
+DV
OE = AGND, +DV
V
OE = AGND, +DV
V
= 1MHz
= 3MHz
= 7MHz
= 10MHz
OH
OL
= 100kHz
= 500kHz
S
S
S
S
= 0.4V
= +DV
S
S
S
= Max., V
= Max., V
and +DV
may cause a latch-up problem. DATEL recommends
along with +5V for +AV
S
S
S
S
S
-0.5V
IH
IL
S
= 0V
S
S
= +DV
and +DV
= Min.,
= Min.,
S
: While the unit has separate pins for both
S
S
S
pins to ground using 10µF
) and the digital supply (+DV
MIN.
OE = +AV
V
Hi-Z to Active, asynchronous with clock.
Active to Hi-Z, asynchronous with clock.
Fin = 1kHz
NTSC 401RE mod. ramp, fc = 14.3MHz
+4.75
—
—
—
—
—
—
+3.0
–20
–55
OH
S
—
20
—
—
—
—
. Compared to the singe +5V
= +DV
®
48-pin plastic LQFP
S
TYP.
S
, +DV
, and V
60
59
60
65
50
49
S
+5.0
150
—
—
27
—
—
—
—
3
0.2 grams
and +DV
S
= Max.,
OL
S
MAX.
= 0V
and +DV
+5.25
+5.25
+150
—
—
—
—
—
—
100
+75
34
—
5
1
1
S
when
S
UNITS
S
), a
S
Volts
Volts
mW
mV
mA
mA
mA
dB
dB
dB
dB
dB
dB
µA
and
°C
°C
to
®