ADC-305 ETC
Document overview
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- PDF pages: 6
Technical content
1 OUTPUT ENABLE (OE) 24 DGND
2 DGND 23 REF. BOTTOM (VRB)
3 BIT 8 (LSB) 22 SELF BIAS 1 (VRBS)
4 BIT 7 21 AGND
5 BIT 6 20 AGND
6 BIT 5 19 ANALOG INPUT (VIN)
7 BIT 4 18 +AVS (+5V)
8 BIT 3 17 REFERENCE TOP (VRT)
9 BIT 2 16 SELF BIAS 2 (VRTS)
10 BIT 1 (MSB) 15 +AVS (+5V)
11 +DVS (+5V) 14 +AVS (+5V)
12 CLOCK INPUT (A/D CLK) 13 +DVS (+5V)
FEATURES
- 8-bit resolution, 20MHz min. sampling rate
- ±½LSB max. differential nonlinearity error
- 18MHz input signal bandwidth
- Subranging, S&H enclosed
- +5V single power, low 85mW max. dissipation
- CMOS compatible logic input
- 3-State TTL compatible output
Figure 1. Functional Block Diagram Both the ADC-305-1 and the ADC-305-3 have the same pin assignment. each containing a sample and hold amplifier. typical) and a wide 18MHz (–1dB) input signal bandwidth.
24 DGNDOUTPUT ENABLE 1
23 VRB
21 AGND
20 AGND
19 VIN
17 VRT
22 VRBS
16 VRTS
- The ADC-305 has separate +AVS and +DVS pins. It is
should not flow through analog grounds.
- Bypass all power lines to ground with a 0.1µF ceramic chip
capacitor in parallel with a 47µF electrolytic capacitor.
- Even though the analog input capacitance is a low 15pF, it
resistor larger than 100 ohms may degrade linearity.
- The input voltage range is determined by voltages applied
The analog input range is normally 2Vp-p. input range in this case is +0.64V to +2.73V nominal. analog input voltage range is 0 to +2.39V in this case. ➁ Short VRB (pin 23) to VRBS (pin 22). Short VRT (pin 17) to VRTS (pin 16). ➂ Short VRB (pin 23) to A GND. Short VRT (pin 17) to VRTS (pin 16). Table 1. Digital Output Coding
Figure 4. Timing Chart
Figure 5. Typical Connection Diagram Figure 6. Typical Performance Curves
10 Supply Current
Differential Linearity Error vs.
MECHANICAL DIMENSIONS INCHES (MM) ADC-305-1 24-Pin DIP (Plastic) 400mil 2.0g ADC-305-3 24-Pin SOP (Plastic) 300mil 0.3g
ORDERING INFORMATION
ADC-305-1 24-Pin Plastic DIP 400 mil ADC-305-3 24-Pin Plastic SOP 300 mil ADC-305 DATEL 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. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark. DS-0342 6/98 DATEL (UK) LTD. Tadley, England Tel: (01256)-880444 DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 01-34-60-01-01 DATEL GmbH Munchen, Germany Tel: 89-544334-0 DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025 ISO 9001ISO 9001REGISTERED DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 Tel: (508) 339-3000, (800) 233-2765 Fax: (508) 339-6356 Internet: www.datel.com Email: sales@datel.com Data Sheet Fax Back: (508) 261-2857 ADC-305-1 1.195 ±0.010 (30.35 .±0.25) 0.020 ±0.004 (0.50 ±0.10) 0.100 TYP. (2.54) 0.047 ±0.006 (1.20 ±0.15) 0.152 ±0.010 (3.85 ±0.25) 0.118 MIN. (3.00 MIN.) 0° to 15° 0.011 ±0.003 (0.28 ±0.08) 0.339 ±0.008 (8.60 ±0.20) 0.400 (10.16) SEATING PLANE 0.020 MIN. (0.50 MIN.) ADC-305-3 0.018 ± 0.004 (0.45 ± 0.10) 0.078 ±0.011 (1.97 ±0.28) 0.213 ±0.008 (5.40 ±0.20) 0.272 (6.90) 0.009 ±0.003 (0.23 ±0.08) 0.050 TYP. (1.27) 0.020 ±0.008 (0.50 ±0.20) 0.596 ±0.010 (15.15 ±0.25) 0.007 ±0.005 (0.18 ±0.13) 0.307 ±0.012 (7.80 ±0.30) ® ® ® ®