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Datasheet ADS119 PDF ( 特性, スペック, ピン接続図 )

部品番号 ADS119
部品説明 12-Bit/ 10MHz/ Low-Power Sampling A/D Converters
メーカ ETC
ロゴ ETC ロゴ 
プレビュー
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ADS119 Datasheet, ADS119 PDF,ピン配置, 機能
®®
ADS-119
12-Bit, 10MHz, Low-Power
Sampling A/D Converters
FEATURES
12-bit resolution
10MHz minimum sampling rate
Functionally complete
Small 24-pin DDIP or SMT package
Requires only ±5V supplies
Low-power, 1.8 Watts
Outstanding dynamic performance
Edge-triggered
No missing codes over temperature
Ideal for both time and frequency-domain applications
GENERAL DESCRIPTION
The ADS-119 is a high-performance, 12-bit, 10MHz sampling
A/D converter. The device samples input signals up to Nyquist
frequencies with no missing codes. The ADS-119 features
excellent dynamic performance including a typical SNR of
69dB.
Packaged in a metal-sealed, ceramic, 24-pin DDIP, the
functionally complete ADS-119 contains a fast-settling sample/
hold amplifier, a subranging (two-pass) A/D converter, a
precise voltage reference, timing/control logic, and error-
correction circuitry. All timing and control logic operates from
the rising edge of a single start convert pulse. Digital input and
output levels are TTL.
Requiring only ±5V supplies, the ADS-119 typically dissipates
1.8 Watts. The unit offers a bipolar input range of ±1.5V.
Models are available for use in either commercial (0 to +70°C)
or military (–55 to +125°C) operating temperature ranges.
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
PIN FUNCTION
1 BIT 12 (LSB)
2 BIT 11
3 BIT 10
4 BIT 9
5 BIT 8
6 BIT 7
7 BIT 6
8 BIT 5
9 BIT 4
10 BIT 3
11 BIT 2
12 BIT 1
24 NO CONNECT
23 ANALOG GROUND
22 NO CONNECT
21 +5V ANALOG SUPPLY
20 –5V SUPPLY
19 ANALOG INPUT
18 ANALOG GROUND
17 OFFSET ADJUST
16 START CONVERT
15 DATA VALID
14 DIGITAL GROUND
13 +5V DIGITAL SUPPLY
Typical applications include signal analysis, medical/graphic
imaging, process control, ATE, radar, and sonar.
OFFSET ADJUST 17
ANALOG INPUT 19
S/H
+
BUFFER
FLASH
ADC
1
REF
Σ
DAC
AMP
FLASH
ADC
2
12 BIT 1 (MSB)
11 BIT 2
10 BIT 3
9 BIT 4
8 BIT 5
7 BIT 6
6 BIT 7
5 BIT 9
4 BIT 9
3 BIT 10
2 BIT 11
1 BIT 12 (LSB)
START CONVERT 16
DATA VALID 15
TIMING AND
CONTROL LOGIC
21
+5V ANALOG
SUPPLY
13
+5V DIGITAL
SUPPLY
14
DIGITAL
GROUND
20
–5V SUPPLY
18, 23
ANALOG
GROUND
Figure 1. ADS-119 Functional Block Diagram
22, 24
NO CONNECT
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.) Tel: (508) 339-3000 Fax: (508) 339-6356 For immediate assistance: (800) 233-2765

1 Page



ADS119 pdf, ピン配列
®®
ADS-119
DIGITAL OUTPUTS
MIN.
+25°C
TYP.
MAX.
0 to +70°C
MIN.
TYP. MAX.
–55 to +125°C
MIN. TYP.
MAX.
UNITS
Logic Levels
Logic "1"
Logic "0"
Logic Loading "1"
Logic Loading "0"
Output Coding
POWER REQUIREMENTS
+2.4 —
— +2.4 —
— +2.4 —
— Volts
— — +0.4 — — +0.4 — — +0.4 Volts
— — –4 — — –4 — — –4 mA
— — +4 — — +4 — — +4 mA
Offset Binary
Power Supply Ranges ‘
+5V Supply
–5V Supply
Power Supply Current
+5V Supply
–5V Supply
Power Dissipation
Power Supply Rejection
+4.75
+5.0
+5.25
+4.75
–4.75
–5.0
–5.25
–4.75
+5.0 +5.25 +4.9
–5.0 –5.25 –4.9
+5.0 +5.25 Volts
–5.0 –5.25 Volts
+200 +215
+200 +215
+200 +215
mA
–180 –205
–180 –205
–180 –205
mA
— 1.8 2.1 — 1.8 2.1 — 1.8 2.1 Watts
— — ±0.01 — — ±0.01 — — ±0.01 %FSR/%V
Footnotes:
ΠAll power supplies must be on before applying a start convert pulse. All supplies
and the clock (START CONVERT) must be present during warmup periods. The
device must be continuously converting during this time. There is slight
degradation in performance when using ±12V supplies.
 See ordering information for availability of ±5V input range. Contact DATEL for
availability of other input voltage ranges.
Ž A 200ns wide start convert pulse is used for all production testing. Only the rising
edge of the start convert pulse is required for the device to operate
(edge-triggered).
 Effective bits is equal to:
Full Scale Amplitude
(SNR + Distortion) – 1.76 + 20 log Actual Input Amplitude
6.02
 This is the time required before the A/D output data is valid after the analog input
is back within the specified range.
TECHNICAL NOTES
1. Obtaining fully specified performance from the ADS-119
requires careful attention to pc-card layout and power
supply decoupling. The device's analog and digital ground
systems are connected to each other internally. For optimal
performance, tie all ground pins (14, 18, and 23) directly to
a large analog ground plane beneath the package.
Bypass all power supplies to ground with 4.7µF tantalum
capacitors in parallel with 0.1µF ceramic capacitors. Locate
the bypass capacitors as close to the unit as possible.
2. The ADS-119 achieves its specified accuracies without the
need for external calibration. If required, the device's small
initial offset and gain errors can be reduced to zero using
the adjustment circuitry shown in Figures 3 and 4. For
operation without adjustment, tie pin 17 to analog ground.
When using this circuitry, or any similar offset and gain-
calibration hardware, make adjustments following warmup.
To avoid interaction, always adjust offset before gain.
3. Applying a start convert pulse while a conversion is in
progress (EOC = logic "1") will initiate a new and inaccurate
conversion cycle.
4. Data is valid only for the time period (55ns, typical) shown in
Figure 2 even if the device is sampling at less than 10MHz.
START
CONVERT
N
50ns typ.
N+1
INTERNAL S/H
INTERNAL EOC
DATA
VALID
10ns typ.
Hold
65ns typ.
Acquisition Time
30ns min.
35ns typ.
37ns max.
15ns typ.
20ns typ.
Conversion Time
Hold
72ns min.
80ns typ.
83ns max.
35ns typ.
40ns typ.
±5ns
60ns typ.
40ns typ.
±5ns
10ns typ.
DATA
DATA N-1 VALID
INVALID DATA
55ns typ.
Scale is approximately 5ns per division.
45ns typ.
INVALID DATA
DATA N VALID
Figure 2. ADS-119 Timing Diagram
INVALID DATA
3


3Pages


ADS119 電子部品, 半導体
ADS-119
®®
THERMAL REQUIREMENTS
All DATEL sampling A/D converters are fully characterized and
specified over operating temperature (case) ranges of 0 to
+70°C and –55 to +125°C. All room-temperature (TA = +25°C)
production testing is performed without the use of heat sinks or
forced-air cooling. Thermal impedance figures for each device
are listed in their respective specification tables.
These devices do not normally require heat sinks, however,
standard precautionary design and layout procedures should
be used to ensure devices do not overheat. The ground and
power planes beneath the package, as well as all pcb signal
runs to and from the device, should be as heavy as possible to
help conduct heat away from the package. Electrically-
insulating, thermally-conductive "pads" may be installed
underneath the package. Devices should be soldered to
boards rather than "socketed", and of course, minimal air flow
over the surface can greatly help reduce the package
temperature.
In more severe ambient conditions, the package/junction
temperature of a given device can be reduced dramatically
(typically 35%) by using one of DATEL's HS Series heat sinks.
See Ordering Information for the assigned part number. See
page 1-183 of the DATEL Data Acquisition Components
Catalog for more information on the HS Series. Request
DATEL Application Note AN-8, "Heat Sinks for DIP Data
Converters", or contact DATEL directly, for additional
information.
3000
2500
2000
1500
1000
500
0
Digital Output Code
Figure 6. ADS-119 Grounded Input Histogram
This histogram represents the typical peak-to-peak noise
(including quantization noise) associated with the ADS-119.
4,096 conversions were processed with the input to the
ADS-119 tied to analog ground.
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
0
0.5 1 1.5 2 2.5 3 3.5 4
Frequency (MHz)
(fs = 10MHz, fin = 4.9MHz, Vin = –0.5dB, 4,096-point FFT)
4.5
5
Figure 7. ADS-119 FFT Analysis
6

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