ADC-207 MURATA-PS | Alldatasheet
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Technical content
Ḥ D GQ D GQ D GQ D GQ D GQ D GQ D G Q D G Q D G Q D G Q D G Q D G Q D G Q D G Q ANALOG INPUT 4 +REFERENCE 6 DIGITAL GROUND 2 ANALOG GROUND 7 RANGE MIDPOINT 5 R/2 R R R R R/2 R/2 –REFERENCE 3 CS1 8 +5V SUPPLY 18 +VDD
1 CLOCK INPUTCLOCK
10 OVERFLOW
11 BIT 1 (MSB)
12 BIT 2
13 BIT 3
14 BIT 4
15 BIT 5
16 BIT 6
17 BIT 7 (LSB)
D GQ D GQ D GQ D GQ /C1981 /C1982 /C1982 /C1981 Figure 1. ADC-207 Functional Block Diagram (DIP Pinout)
FEATURES
■ 7-bit fl ash A/D converter ■ 20MHz sampling rate ■ Low power (250mW) ■ Single +5V supply ■ 1.2 micron CMOS technology ■ 7-bit latched 3-state output with overfl ow bit ■ Surface-mount versions ■ High-reliability version ■ No missing codes The ADC-207 is the industry’s fi rst 7-bit fl ash converter using an advanced high-speed VLSI 1.2 micron CMOS process. This process offers some very distinctive advantages over other processes, making the ADC-207 unique. The smaller geo- metrics of the process achieve high speed, better linearity and superior temperature performance. Since the ADC-207 is a CMOS device, it also has very low power consumption (250mW). The device draws power from a single +5V supply and is conservatively rated for 20MHz operation. The ADC-207 allows using sampling apertures as small as 12ns, making it more closely approach an ideal sampler. The small sampling apertures also let the device operate at greater than 20MHz. The ADC-207 has 128 comparators which are auto-balanced on every conversion to cancel out any offsets due to temperature and/or dynamic effects. The resistor ladder has a midpoint tap for use with an external voltage source to improve integral linearity beyond 7 bits. The ADC-207 also provides the user with 3-state outputs for easy interfacing to other components. There are six models of the ADC-207 covering two operating temperature ranges, 0 to +70°C and –55 to +125°C. Two high-reliability "QL" models are also available. INPUT/OUTPUT CONNECTIONS DIP Pins FUNCTION LCC Pins
1 CLOCK INPUT 1
2 DIGITAL GROUND 4
3 –REFERENCE 5
4 ANALOG INPUT 6
5 MIDPOINT 7
7 ANALOG GROUND 9
8 CS1 11
9 CS2 12
10 OVERFLOW 13
11 BIT 1 (MSB) 14
12 BIT 2 16
13 BIT 3 17
14 BIT 4 19
15 BIT 5 20
16 BIT 6 21
17 BIT 7 (LSB) 23
7-Bit, 20MHz, CMOS Flash A/D Converters MDA_ADC-207.B01 Page 1 of 6 For full details go to www.murata-ps.com/rohs www.murata-ps.com www.murata-ps.com Technical enquiries email: data.acquisition@murata-ps.com, tel: +1 508 339 3000
➀ At full power input and chip selects enabled. ➁ At 4MHz input and 20MHz clock. ➂ For 10-step, 40 IRE NTSC ramp test. ➃ Adjustable using reference ladder midpoint tap. See ADC-207 Operation. Figure 2. Typical Connections for Using the ADC-207
- Input Buffer Amplifi er – Since the ADC-207 has a switched capacitor type input, the input
either the HA-5033 or Elantec 2003. See Figure 2 for typical connections.
- Reference Ladder – Adjusting the voltage at +REFERENCE adjusts the gain of the ADC-207.
the ADC-207 to closely resemble an ideal sampler. See Figure 4.
- At sampling rates less than 100kHz, there may be some degradation in offset and differential
time spent in the sample mode). MUST NOT BE EXCEEDED as irrevocable damage to the ADC-207 will occur.
Values shown here are for a +5.12V reference. Scale other references proportionally.
- Note also that the weighting for the comparator resistor network leaves the fi rst
not necessary unless better than 7-bit linearity is needed. Figure 1 and Timing Diagram. The ADC-207 uses a single clock input. between a resistor tap and its respective comparator transition voltage. *Note that the overfl ow code does not clear the data bits. Table 1. ADC-207 Output Coding Table 2. Chip Select Truth Table above 20MHz. Such a confi guration will closely resemble an ideal sampler.
OVERFLOW signal of device A turns off device A and turns on the device B. The OVERFLOW signal of device A is also used as MSB for 8-bit operation. shows the circuit connections for the application. Figure 5 shows an actual ADC-207 plot of the Beat Frequency Test. ADC-207’s high-frequency performance.
- Full power input bandwidth of all 128 comparators.
- Phase response linearity vs. instantaneous signal magnitude.
- Comparator slew rate limiting.
completely through the input voltage range. bit to the device B’s output.
11 CLOCK OUT
Figure 3. Optional Pulse Shaping Circuit Figure 4. Using Two ADC-207’s for 8-Bit Operation
MECHANICAL DIMENSIONS INCHES (mm)
ORDERING INFORMATION
MODEL TEMP. RANGE PACKAGE ADC-207MC 0 to +70°C 18-pin DIP ADC-207MM –55 to +125°C 18-pin DIP ADC-207MM-QL –55 to +125°C 18-pin DIP ADC-207LC 0 to +70°C 24-pin CLCC ADC-207LM –55 to +125°C 24-pin CLCC ADC-207LM-QL –55 to +125°C 24-pin CLCC ACCESSORIES ADC-B207/208 Evaluation Board for DIP Version (without ADC-207) 0.400 (10.16 ) 0.250 ±0.005 (6.35 ±0.13) 0.050 (1.270) TYP. 0.020 ±0.005 (0.51 ±0.13) 0.090 MAX. (2.29 MAX.) +0.010 –0.005 +0.25 –0.13 0.400 (10.16 ) +0.010 –0.005 +0.25 –0.13 0.250 ±0.005 (6.35 ±0.13) PIN 1 INDEX TOP VIEW 24-Pin Ceramic LCC 18-Pin Ceramic DIP 0.960 MAX. (24.38 MAX.) 0.220 / 0.310 (5.59 / 7.87) DATEL /C65/C68/C67/C45/C50/C48/C55/C77/C67 PIN 1 IDENTIFIER 18 10 0.200 MAX. (5.1 MAX.) 0.100 TYP. (2.540) 0.014 / 0.023 (0.35 / 0.58) 0.015 / 0.060 (0.38 /1.52) 0.290 / 0.320 (7.36 / 8.13) SEATING PLANE 0.035 (0.889) 0.008 / 0.015 (0.20 / 0.38) ADC-207 7-Bit, 20MHz, CMOS Flash A/D Converters MDA_ADC-207.B01 Page 6 of 6 Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change without notice. © 2009 Murata Power Solutions, Inc. USA: Mansfi eld (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Canada: Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com UK: Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com France: Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Germany: München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com Japan: Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com China: Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Singapore: Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A. Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com 03/20/09